feat: add configurable transport-independent CORS policy

test: record v0.23 remote consumer and performance acceptance
feat: add precise diagnostics and optional client copy logging controls
2026-09-26 19:53:28 +08:00 · 2026-09-26 18:06:40 +08:00 · 2026-09-26 18:04:33 +08:00 · 2026-09-26 16:16:37 +08:00 · 2026-09-26 16:14:54 +08:00 · 2026-09-26 15:30:32 +08:00
164 changed files with 8843 additions and 1749 deletions
--- a/ADVANCED.md
+++ b/ADVANCED.md
@@ -11,7 +11,7 @@
 | `openapi` | 路由与 OpenAPI 3.0.3 同时注册、DTO schema、响应信封 | 显式声明请求/响应；不自动推断任意 Handler 行为，不附带 Swagger UI |
 | `auth` | RS256/EdDSA JWT 验证与公钥轮换、可撤销 Session、Policy 接口 | 登录验证和业务授权规则由接入方提供；不自动获取 token 指定的密钥 |
 | `telemetry` | HTTP 入站/出站、Redis、SQL spans，HTTP 指标和 traceId 日志关联 | 注入 OTel exporter/reader 后才外发；SQL Query span 不覆盖后续遍历；不接管全局 provider |
-| `config` / `logx` | JSON/YAML 文件、环境变量覆盖、动态日志级别、轮转/脱敏/堆栈/慢请求 | 热更新只开放日志级别；连接池、监听、认证等静态变更要求重启 |
+| `config` / `logx` | JSON/YAML/XML 文件、显式环境引用、动态日志级别、轮转/脱敏/堆栈/慢请求 | 热更新只开放日志级别；连接池、监听、认证等静态变更要求重启 |
 | `resilience` | 失败阈值、熔断冷却、单探针恢复、上游并发隔离 | 一个实例对应一个依赖；默认内存状态，不做跨进程全局熔断 |
 | `middleware/redis` | 跨副本限流、幂等 claim/回放、容量限制 | 专用 Redis namespace；TTL 窗口内保护不等于永久业务去重 |
 | `queue` / `queue/redis` | 持久消息接口、Streams 接管、有限重试、失败消息管理 | 至少一次交付，处理器必须幂等；持久性取决于 Redis 部署 |
@@ -102,7 +102,7 @@ err = consumer.Run(serviceContext, func(ctx context.Context, item queue.Delivery

 ## 配置与日志热更新

-`config.LoadFile(path, prefix)` 按默认值→文件→非空环境变量加载并验证。两种文件格式都使用 JSON tag 的 lowerCamelCase，duration 可以写 `"5s"`；文件上限 1 MiB，拒绝未知字段、多文档和非法值。自定义 prefix 要包含期望的尾部下划线，例如 `BILLING_`。空环境变量沿用文件值，不清空已配置字段。
+`config.LoadFile(path)` 使用默认值→文件字段显式引用→类型绑定→校验；没有自动环境覆盖。用 `${NAME}` 或 `${NAME:-fallback}` 指定来源，完整规则与迁移见 [CONFIG.md](CONFIG.md)。

 ```yaml
 address: '127.0.0.1:8080'
@@ -113,7 +113,7 @@ log:
  format: json
 ```

-先按配置创建 `logx.New(cfg.Log)`，再 `config.NewReloader(path, prefix, logger)`。显式调用 `Reload()` 或运行 `Watch(ctx, time.Second, onError)`；后者阻塞，生命周期由应用负责。只有 `log.level` 允许变化，校验失败或静态字段变化保留原快照与日志级别。子 logger 共享动态级别。替换文件时建议使用临时文件 + rename。
+先按配置创建 `logx.New(cfg.Log)`，再 `config.NewReloader(path, logger)`。显式调用 `Reload()` 或运行 `Watch(ctx, time.Second, onError)`；后者阻塞，生命周期由应用负责。只有 `log.level` 允许变化，校验失败或静态字段变化保留原快照与日志级别。子 logger 共享动态级别。替换文件时建议使用临时文件 + rename。

 ## 熔断与观测

--- a/AGENTS.md
+++ b/AGENTS.md
@@ -6,3 +6,5 @@
 - examples 使用通用场景，避免依赖业务项目、私有数据库或线上服务。必要的外部基础设施配置应明确说明。
 - 2026-09-25 用户决定：移除 mappings/mappingFiles 及结构映射代码生成机制，改用可选 copyx 工具包。不得恢复另一套 JSON 或 Go 映射声明语言。
 - 深拷贝的自定义转换结果不得与输入共享可变引用；发现共享应报错，不能降级成浅拷贝或静默接受。
+
+- 2026-09-26 用户决定：配置文件显式声明固定值或 `${NAME}` / `${NAME:-fallback}`，旧自动环境覆盖、前缀/别名及 env/envDefault 标签模式移除，不得重新引入隐式二次覆盖。项目维护 Config/Default/Validate/文件，生成器维护 Load/main。
--- a/API.md
+++ b/API.md
@@ -48,7 +48,7 @@ go run ./cmd/go-omni new --api examples/contracts/user.api \
  --log-output file --log-format json ../userService
 ```

-`api generate` 在新目录中也会生成完整项目。默认只监听 localhost；`GO_OMNI_HTTP_ADDR` 修改地址，`GO_OMNI_TRANSPORT=native` 切换网络层。配置顺序为默认值 → `etc/config.yaml` → 环境变量。文件日志支持现有轮转配置。远程试用使用与 CLI 一致的固定版本，见 [发布说明](RELEASE.md)。
+`api generate` 在新目录中也会生成完整项目。默认只监听 localhost；`GO_OMNI_HTTP_ADDR` 修改地址，`GO_OMNI_TRANSPORT=native` 切换网络层。配置顺序为 Default() → `etc/config.yaml` 中的显式环境引用 → 类型绑定 → Validate()；固定值不再被隐式覆盖。文件日志支持现有轮转配置。远程试用使用与 CLI 一致的固定版本，见 [发布说明](RELEASE.md)。

 API 项目现在支持组合数据库、存储和日志：

@@ -63,7 +63,7 @@ go-omni new --api user.api --module example.com/userService \

 初次选项记录在 `.goOmni/apiManifest.json`，以后直接 `api generate` 会继承。已有项目通过参数切换选项会报错，因为初始化代码属于业务方；可在新目录生成对照后手动迁移。`--force` 不允许覆盖 API 项目。new 与 api new 统一生成契约项目，不再使用旧式 CRUD 目录。

-MySQL 使用官方 `database/mysql` 结构化适配器，密码从 `GO_OMNI_DB_PASSWORD` 覆盖，非秘密池配置位于 YAML，环境变量优先。存储使用原有 `GO_OMNI_STORAGE_*`；API 项目不会额外生成公开的签名发放接口，鉴权和对象权限由业务实现。初始化失败会清理已打开资源，退出清理可重复调用。
+MySQL 使用官方 `database/mysql` 结构化适配器，生成文件以 `password: "${GO_OMNI_DB_PASSWORD}"` 显式读取密码；其他字段可写固定值或引用，缺失项保留 Default()。存储配置也只读取文件明确引用的变量；API 项目不会额外生成公开的签名发放接口，鉴权和对象权限由业务实现。初始化失败会清理已打开资源，退出清理可重复调用。

 HTTP 请求类型不能推导数据库表结构；迁移和 Repository 由业务自己维护。当前目录的完整示例见 [managedService](examples/managedService/README.md)。MySQL、事务审计和鉴权实现可参考 [旧目录用户管理示例](examples/userService/README.md)，接入时按 [项目指南](PROJECT.md) 装配到 config/svc/logic。

--- a/BUSINESS_DEVELOPMENT.md
+++ b/BUSINESS_DEVELOPMENT.md
@@ -5,7 +5,7 @@
 ## 实施与验收清单

 - [x] 运行期：资源登记、逆序释放、幂等关闭、失败回滚、故障原因保留归框架；生成入口与项目依赖初始化边界明确。多 App 日志隔离、标准 log.Logger 适配、可信请求元数据与依赖中间件示例。
- [x] 配置：项目完整结构体环境覆盖；默认值→文件→环境；嵌套、duration、slice、显式零值、空值策略、必填与脱敏；日志无副作用完整校验。
+- [x] 配置：Default()→文件显式环境引用→类型绑定→Validate；嵌套、duration、slice、显式零值、必填/备用值、转义与安全诊断；日志无副作用完整校验。
 - [x] 数据库：官方 MySQL 结构化配置/TLS/驱动日志适配，继续复用 OpenConnector 和唯一连接池；独立启动检查、失败清理、生成器接入；不内置版本/表结构/业务错误策略。
 - [x] 响应契约：数组、可空对象、成功 null、独立 HTTP 204；Logic/Handler/OpenAPI/漂移检查一致。
 - [x] 请求契约：未知 query、JSON UTF-8/charset、无 Body/必填空对象/可选 Body，App 默认与路由覆盖；scalar/any/数组/大小限制一致，普通 JSON 只绑定一次。
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,46 @@
 # Changelog

+## v0.24.0-preview（2026-09-26）
+
+- 新增可选 cors 包和 server.cors 配置；生成项目直接加载，手写项目使用 omni.WithCORS，独立 HTTP 服务可使用 Policy.Wrap。默认关闭，无新增第三方依赖。
+- 精确来源白名单、方法/请求头、暴露头、凭据和预检缓存可配置；拒绝凭据与通配来源混用、非法来源/头及歧义的重复请求头，校验错误定位具体字段。
+- 在路由和鉴权之前处理预检；实际请求仍执行原有中间件，统一响应、404/405、上传下载和流式能力保持。nethttp/native/HTTP2 共用策略。
+- 补充真实生成项目、TLS 三种 transport、20 项真实浏览器检查、race/fuzz/性能基准；同步 README、配置指南、cors 指南及 examples/cors。
+- 没有移除现有功能或修改默认跨域行为。代理已负责 CORS 的项目保持关闭，避免重复头；高级调用 Router().ServeHTTP 不经过应用外层 CORS。
+
+## v0.23.0-preview（2026-09-26）
+
+- MySQL/连接池、日志、HTTP 客户端、生命周期和请求策略返回字段级安全诊断，配置加载器保留文件/变量/位置与原始错误链。
+- httpc.JSON 新增 WithSuccessStatuses，单次调用可限制允许的 2xx，默认兼容，拒绝响应继续关闭和有界回收。
+- copyx.Check[S,T] / Copier.Check 预检嵌套类型与现有规则；修正空集合隐藏类型不匹配，动态接口和 converter 的具体行为继续运行时验证。
+- logx.Config.TimeZone 绑定 Logger 实例，JSON/text/子 Logger/标准日志适配一致；不修改 time.Local 或业务时间属性。
+- 无新映射文件、强制模块或第三方依赖；更新 README、各包指南和 developerTools 可运行示例。错误文本更精确，空集合中的确定类型错误现在会被拒绝。
+
+## v0.22.0-preview（2026-09-26）
+
+- 文件显式环境引用与备用值，字符串组合/转义，安全有界展开和类型绑定；变量值原样插入、不递归处理。
+- 移除隐式环境覆盖、EnvOptions/前缀/别名及 env/envDefault；数据库统一使用文件加载，不再单独扫描环境。
+- 生成 main/Load 新增 -check-config，精简配置文件，保留开发者扩展；错误字段建议和迁移检查。
+- README、CONFIG、数据库/HTTP 客户端指南及示例同步新规则；配置中的响应模板需要 $$ 转义，.api 不变。
+
+## v0.21.0-preview（2026-09-26）
+
+- httpc 可配置环境/直连/固定代理、常用连接阶段超时和独立空闲池参数。
+- JSON 新增逐请求 Header 快照与响应大小选项，保持有界读取、关闭和认证隔离。
+- 成功请求少复制和退避计算，丢弃响应流式处理，错误体有界回收以改善连接复用。
+- 增加真实本地代理、超时、连接限制/回收、并发、日志脱敏、gzip、fuzz 和修改前后基准。
+- JSON 自定义方法接口签名需同步 variadic 参数；借用 Transport 的参数混配现在报错。详见 httpc/README.md。
+
+
+## v0.20.0-preview（2026-09-26）
+
+- 生成项目配置加载入口持续由生成器维护；保留业务字段、默认值、校验与 NewLoader 扩展文件。
+- config.LoadProject 统一 JSON/YAML/XML、环境覆盖和校验；提供实例级 Decoder 注册。
+- 文件/字段/环境/行列的安全诊断，Invalid/AtField 与原始错误链。
+- 增加格式等价、精度、null/空数组、并发、资源限制、默认值隔离、真实生成项目与性能验收。
+- 旧手写 Load 必须显式迁移；低层 API 保留。固定数组严格长度、YAML alias/merge/custom tag 拒绝。用法及限制见 CONFIG.md。
+
+
 ## v0.19.0-preview（2026-09-25）

 - 新增通用可选 copyx：构造器、浅/深拷贝、精确类型转换、字段规则、nil/零值策略、并发复用。
--- a/CONFIG.md
+++ b/CONFIG.md
@@ -0,0 +1,195 @@
+# 配置：文件明确声明值的来源
+
+v0.22 起只使用这一条流程：
+
+```text
+项目 Default() → 解析选中的一个文件 → 解析字段值中的环境引用
+→ 按 Go 类型绑定已提供的字段 → 项目 Validate() → 初始化日志和依赖
+```
+
+没有环境前缀、别名表或隐式二次覆盖。业务只维护 `Config`、`Default()`、`Validate()` 和配置文件。项目 Validate 中继续调用嵌套框架配置的 Validate；生成模板已包含这些调用。验证函数只检查值，不应打开资源。
+
+## 直接使用
+
+```go
+type Config struct {
+    Server omniConfig.Config `json:"server"`
+    BatchSize int            `json:"batchSize"`
+    Enabled bool             `json:"enabled"`
+    Password string          `json:"password"`
+    Timeout time.Duration    `json:"timeout"`
+}
+func Default() Config {
+    return Config{Server: omniConfig.Default(), BatchSize: 100, Enabled: true,
+        Timeout: 3*time.Second}
+}
+func (c Config) Validate() error {
+    if err := c.Server.Validate(); err != nil {
+        return omniConfig.AtField("server", err)
+    }
+    if c.BatchSize < 0 { return omniConfig.Invalid("batchSize", "must not be negative") }
+    return nil
+}
+// 手写项目；生成项目的 Load 已自动调用此入口。
+cfg, err := omniConfig.LoadProject("etc/config.yaml", Default())
+```
+
+```yaml
+server:
+  address: "${HTTP_ADDR:-127.0.0.1:8080}"
+password: "${DB_PASSWORD}"
+timeout: "${REQUEST_TIMEOUT:-3s}"
+enabled: false
+```
+
+文件未写 batchSize，保留 100；enabled 明确写 false，就使用 false。变量名字完全由文件决定，不需要对应 Go 字段名。配置文件可只列出部署需要变动的字段；不会自动导出/打印包含凭据的完整配置。
+
+## 引用语法
+
+| 文件里的值 | 含义 |
+| --- | --- |
+| `host: 127.0.0.1` | 固定值，不读取任何环境变量 |
+| `password: "${DB_PASSWORD}"` | 未设置或空字符串报错，不回退到 Default() |
+| `port: "${DB_PORT:-3306}"` | 未设置或为空时使用 3306 |
+| `sessionToken: "${SESSION_TOKEN:-}"` | 未设置或为空时使用空字符串，是否合法由目标类型和 Validate 决定 |
+| `url: "https://${HOST}:${PORT:-443}/v1"` | 普通字符串中可出现多个引用 |
+| `literal: "$${DB_PASSWORD}"` | 得到字面量 `${DB_PASSWORD}`，不读取变量 |
+| `literal: "$$cost"` | `$$` 转义一个 `$`，得到 `$cost` |
+
+变量名遵循 `[A-Za-z_][A-Za-z0-9_]*`。只支持 `${NAME}`、`${NAME:-fallback}` 和 `$$` 转义，不支持 `${NAME-default}`、嵌套引用或 shell 表达式。普通单独的 `$` 保留。fallback 到第一个 `}` 结束，可包含冒号、`:-`、引号等文件格式允许的字符；需要包含 `}` 的值可使用固定值或环境变量。
+
+解析只扫描文件的**已解码字段值**，不替换 YAML/JSON/XML 源文本，不扩展字段名，也不扫描 Default() 的字符串。插入的环境值和 fallback 不再展开。密码 `DDSFLKJlsf:saf:-123`、引号、换行、`${OTHER}` 均原样保留，不破坏文档结构。字符串不统一 TrimSpace；`"0"`、`"false"` 和全空格字符串均属于已提供。
+
+同一变量每次加载最多读取一次；下一次加载会重新读取。没有全局变量值缓存。并发加载各自维护结果，不能把调用者正在修改的默认配置当作共享可变输入。
+
+## 类型与覆盖
+
+目标 Go 类型决定引用结果的转换：整数、浮点数、布尔值、`time.Duration`、字符串、指针及已有自定义 JSON/Text 反序列化。数值范围按目标位宽检查，整数不经过 float64。自定义反序列化仍由自定义类型解释文本，不猜测其业务含义。
+
+- 文件缺失字段保留初始值；显式 0、false、空字符串正常覆盖，不用零值判断字段是否存在。
+- `${MISSING}` 失败就报错；需要备用值必须写 `${MISSING:-value}`。
+- 字符串编号 `"001"` 保持 `001`；绑定到 int 才转整数。环境里的 `null` 不自动变成空指针，`[1,2]` 不自动变成数组。
+- 集合直接在文件里声明，可在每个标量元素中使用引用，例如 `ports: ["${PORT_A:-8080}", "${PORT_B:-8081}"]`。
+- 数组整体替换；空 slice 保持非 nil；固定长度 Go 数组要求长度一致。map 合并键，已提供键的值整体替换。
+- 固定文件 null 沿用 JSON 语义：清空指针/map/slice/interface，普通值字段保持初始值。需要区分 null 时使用指针。
+- `any` 的引用结果保持字符串，不猜测动态类型。固定 JSON/YAML 数字使用 json.Number 保留精度。
+- 引用成功后的值不会再覆盖一次。旧 `GO_OMNI_*` 名称只有出现在文件引用中才有作用；不隐式重置日志 file/rotation。
+
+普通固定字符串仍按原有严格绑定规则处理；不会为了支持变量，把所有 `"123"` 都自动转换成数字。
+
+## YAML、JSON、XML 一致
+
+使用 Go 的 `json` 字段名，无需维护三份 tag。以下三份文件等价：
+
+```yaml
+port: "${PORT:-3306}"
+password: "${PASSWORD}"
+```
+
+```json
+{"port":"${PORT:-3306}","password":"${PASSWORD}"}
+```
+
+```xml
+<config><port>${PORT:-3306}</port><password>${PASSWORD}</password></config>
+```
+
+XML 使用 `<config>` 根，标量占位符写在普通叶元素或 `type="string"` 元素中，由 Go 字段决定类型；显式 `type="number"` / `type="bool"` 表示文件里已经有合法数字/布尔常量。XML 数组用 `type="array"` 加 `<item>`；空对象 `type="object"`、null 用 `type="null"`。不从重复元素猜测数组。
+
+`.api` 不经过配置加载器，响应模板 `${code}` 不变。**如果把响应模板写在 YAML/JSON/XML 配置文件里，须转义：**
+
+```yaml
+server:
+  response:
+    body:
+      code: "$${code}"
+      msg: "$${message}"
+      data: "$${data}"
+```
+
+加载后恢复为 `${code}` 等响应占位符，仍由响应编码器处理。
+
+## 生成项目与检查
+
+| 文件 | 维护方 |
+| --- | --- |
+| `main.go`、`internal/config/loadGen.go` | 生成器维护，纳入 `generate --check` |
+| `internal/config/config.go` | 项目维护 Config、Default、Validate |
+| `etc/config.yaml` 等选定文件 | 项目维护，重新生成不覆盖 |
+| `internal/config/loader.go` | 初次生成即可使用，仅添加自定义格式时才修改 |
+
+```sh
+go run . -config etc/config.test.yaml -check-config
+go run . -config etc/config.local.yaml
+go build .
+go-omni api generate --check
+```
+
+`-check-config` 使用与启动完全相同的 Load，通过时退出 0、失败时非零；不打印配置，不创建日志文件、数据库、后台组件或 HTTP 监听。它只校验配置，不检测真实数据库连接或证书握手。
+
+`-config` 只选一个文件，不自动叠加 local/test/default。指定文件不存在时报错；`-config ''` 只使用 Default() 后校验，不读取任何环境变量，也不寻找其他文件。示例：[examples/configuration](examples/configuration/README.md)。
+
+## 安全诊断与限制
+
+```text
+config "etc/config.yaml":7:9 env "DB_PORT" field "database.port": expected a valid int
+```
+
+`*config.Error` 包含 File/Field/Env/Line/Column/Reason。引用错误同时保留文件与环境变量名；组合引用失败可列出多个名字。行列定位原文件字段，不把环境值伪装成源文件文本。无法取得位置时仍提供可用的文件/字段信息。
+
+用 `config.Invalid(field, publicReason)` 或 `config.AtField(prefix, err)` 报业务校验错误。未知字段给出唯一且接近的已声明字段建议，不自动修改。错误默认不打印原值；自定义 Reason 不应拼入秘密值。原始 cause 仍支持 errors.Is/As，不要把 Unwrap 后的错误或整个配置写到日志。
+
+文件最多 1 MiB；单个环境值/展开字段最多 1 MiB，展开字符串合计/变量缓存分别最多 4 MiB；解析/展开限制 64 层、100000 个节点与引用计数。拒绝无效 UTF-8、多文档、重复字段、未知字段、非普通文件；YAML 不接受 alias/merge/custom tag，XML 不接受 DTD/外部实体。不执行 shell，不自动加载 `.env`。
+
+## 框架模块的字段诊断
+
+v0.23 起 MySQL（含连接池/TLS）、通用数据库池、日志（含轮转/时区）、HTTP 客户端、退出阶段和请求策略返回字段级安全原因。沿用项目已有的 `config.AtField("database", err)` / `config.AtField("server", err)`，自动组合嵌套字段，不需业务重复校验基础参数。
+
+例如文件中 `database.port: "${DB_PORT}"` 的引用值为 70000：
+
+```text
+config "etc/config.yaml":3:9 env "DB_PORT" field "database.port": must be between 1 and 65535
+```
+
+日志级别非法指向 `server.log.level`；池参数指向 `database.pool.maxIdleConns` / `pingTimeout`。框架只公开已定义的安全原因，第三方/项目普通 error 仍显示 validation failed 并保留 errors.Is/As 原因链；业务使用 Invalid/AtField 提供公开原因。不要解析错误字符串；使用 `*config.Error` 字段。未提供字段的位置可能不可用，字段与原因仍保留。
+
+生成项目现有 Load 和 `-check-config` 自动获得这些诊断。日志可在 `server.log.timeZone` 配置 IANA 名称，见 [实例时区](logx/README.md#实例时区)。
+
+## 可选解析器与测试来源
+
+内置格式无需项目手写加载器。需要额外格式时在已有 NewLoader 注册 Decoder，后续仍自动经过同一引用/绑定/校验流程：
+
+```go
+func NewLoader() (*omniConfig.Loader, error) {
+    return omniConfig.NewLoader(
+        omniConfig.WithDecoder("custom", omniConfig.JSONDecoder{}),
+    )
+}
+```
+
+Decoder 返回 Document（map/string/bool/json.Number/nil/[]any，XML 类标量可用 Text），可提供 Positions。实例注册无全局 init；插件必须可并发调用、不修改共享输入，并且是可信 Go 代码。
+
+测试或嵌入宿主可以用 `WithLookupEnv(func(string)(string,bool))` 替换引用查找函数。它仍然只读取文件明确引用的名称，不启用任何自动覆盖。普通业务不需要这个选项。
+
+## v0.22 迁移：旧模式已移除
+
+这是不兼容调整，不保留两套加载逻辑：
+
+- 删除 `EnvOptions`、`LoadFromEnv`、`ApplyEnv`、`OverlayEnv`、`ApplyDefaults`、`ServerEnvAliases` 和 `env`/`envDefault` 标签处理；检出遗留标签会提示迁移。
+- 删除 `database.ConfigFromEnv` / `database.ApplyEnv`；数据库配置作为项目 Config 的字段绑定。DSN 字段可在文件里使用 `dsn: "${DB_DSN}"`，序列化 database.Config 不输出 DSN 原值。
+- `LoadProject(path, defaults[, loader])` 不再接收 EnvOptions；`LoadFile(path)`、`NewReloader(path, logger)` 不再接收前缀。
+- `omni.LoadConfig(path)` 的参数现在是文件路径；空路径只用框架默认值。
+
+迁移顺序：
+
+1. 将 envDefault 默认值搬入 Default()，移除 env/envDefault 标签。需要文件绑定的旧 `json:"-"` 密钥字段改成明确 json 名称；不打印配置对象。
+2. 按实际部署需要，在选定文件写环境引用。固定值保持固定，不按原前缀猜测。原先依赖环境切换日志输出的项目，应在文件明确配置 file/output/rotation。
+3. 配置文件中的其他 `${...}` 模板改成 `$${...}` 字面量；`.api` 无需修改。
+4. 手写项目改为 LoadProject。生成项目保留 Config/Default/Validate/NewLoader，删除旧手写 Load 后重新生成；main/loadGen 由生成器更新，业务配置文件不会被静默改写。
+5. 升级匹配的 CLI 与框架，执行 generate、generate --check、go test、go build 和 `-check-config`，再使用真实部署配置启动。
+
+低层 `DecodeFile(path, defaults[, loader])` 也解析显式引用，但不调用 Validate；默认值和原始 Document 都不会因失败而被部分修改。日志 Reloader 仍只允许 log.level 变化，其他静态字段变更要求重启。
+
+## 跨域配置
+
+生成项目的 `server.cors` 由本加载流程直接绑定、校验并交给 App，不需要修改生成入口。支持固定来源数组或元素内显式环境引用；非法来源定位具体数组元素。默认关闭，完整配置与行为见 [CORS 指南](cors/README.md)。
--- a/COPY.md
+++ b/COPY.md
@@ -28,6 +28,31 @@ if err := copyx.Copy(&input, req); err != nil { return err }

 新字段：普通接口只改 `.api` 和使用该字段的 Logic。独立 DTO/业务类型都需要此字段时，两边各声明一次；同名同类型不增加拷贝配置。检查在运行时发生，实际类型对必须有测试，不能把运行时工具当作旧生成器的编译期字段覆盖检查。

+## 类型预检
+
+v0.23 新增可选预检，无需填写映射文件或构造测试值：
+
+```go
+// 参数方向是源 → 目标；与 Copy 使用同一组选项。
+if err := copyx.Check[Request, BusinessInput](options...); err != nil {
+    return err
+}
+// 复用已有 Copier：传结果类型，不添加 Copy 所需的额外输出指针。
+err := copier.Check(reflect.TypeFor[Request](), reflect.TypeFor[BusinessInput]())
+```
+
+适合 CI 测试或初始化检查；这是程序执行的类型检查，不是 Go 编译器自动证明。递归检查切片/数组元素、map 键值、指针、嵌套字段、改名、忽略和严格覆盖；用已访问类型对处理递归结构。不执行 converter，也不调用构造器，不读取实例值。错误路径如 `$.Rows[].Value: copyx: incompatible types: string -> int`。
+
+Check 复用 Copy 的规则，包括浅拷贝对同类型容器的直接赋值：这种情况下内部 converter 不会自动逐项执行。需要处理内部字段时选择深拷贝或容器 converter。
+
+- 未知具体值的源 interface 需要运行时验证；无法静态判定时返回 `ErrDynamicType`。项目可给该接口类型对提供精确 converter 并承担内容验证。
+- 已注册 converter 的签名被接受，但函数不在 Check 中执行；其返回错误、panic、金额规则不能靠预检证明。
+- nil 到非可空目标、map 键转换碰撞、深拷贝结果是否残留源引用继续在 Copy 时检查。Check 成功不会关闭这些保护。
+- 实际 Copy 也修正了空集合的检查缺口：确定的嵌套类型不匹配不再因为切片/map 为空或数组长度为 0 而通过。需要这些转换时提供显式 converter；目标仍只在整体成功后更新。
+- 不引入全局配置、映射语言或业务类型；Copier.Check 可并发调用，不共享每次检查的遍历状态。
+
+示例：[developerTools](examples/developerTools/README.md)。普通同名同类型字段不需要额外配置。
+
 ## 深拷贝与构造器

 ```go
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -1,4 +1,4 @@
-# 通用业务开发指南（v0.19.0-preview）
+# 通用业务开发指南（v0.24.0-preview）

 从 [README](README.md) 创建服务后，业务主要维护 `.api`、配置、`svc.Init`、Logic、Repository 和项目中间件。本页说明通用接入能力；字段、错误码、权限、表结构和事务边界都由项目定义。

@@ -100,42 +100,13 @@ defer reader.Close()

 不声明 multipart 字段时，保留原来的 `body *httpx.Body` 流式入口，不创建临时文件。该方式适合特殊协议；项目应在不可撤销副作用之前完成校验并调用 `body.Complete()`。下载和原始回调继续使用 `@produces` / `@body(mode: raw)`。

-## 完整业务配置的环境覆盖
+## 文件声明配置来源

-生成项目默认执行：代码与 `envDefault` 默认值 → JSON/YAML 文件 → 全结构体环境覆盖 → 既有框架环境别名 → `Validate`。增加业务字段不需要另外写 `os.Getenv`。
+项目维护 Config、Default()、Validate() 和配置文件；生成器维护 Load/main。流程为默认值→选定文件→显式 `${NAME}` / `${NAME:-fallback}` 引用→类型绑定→校验。没有前缀、别名或 env/envDefault 隐式覆盖。

-```go
-type ClientConfig struct {
-    Endpoint string        `json:"endpoint" env:"CLIENT_ENDPOINT,required"`
-    Token    string        `json:"-" env:"CLIENT_TOKEN,required,secret,empty=reject"`
-    Timeout  time.Duration `json:"timeout" envDefault:"3s"`
-    Retries  []int         `json:"retries"`
-    Enabled  bool          `json:"enabled"`
-}
-```
+固定值保持固定，缺失字段保留 Default()，0/false/空字符串正常覆盖；引用失败不回退初始化默认值。`$$` 转义 `$`，字符串凭据保留空格与特殊字符。

-把字段加入项目 `Config` 后，默认环境名取 `GO_OMNI_` 加 JSON 路径的 UPPER_SNAKE_CASE，如 `GO_OMNI_CLIENT_TIMEOUT`。显式 env 名是完整名称，可以使用自己的业务前缀。`env:"-"` 排除整个子树；`json:"-"` 字段只有显式 env 标签才参与。
-
-duration 使用 `250ms`、`3s`；slice/map 使用 JSON，如 `[1,3,5]`、`{"retry":"2s"}`。支持嵌套、零/false、空数组、自定义 TextUnmarshaler。空环境值默认允许；可选择 `empty=ignore` 或 `empty=reject`。required 要求字符串非空、指针/集合非 nil；0 和 false 可以是合法业务值，范围由项目 Validate 决定。
-
-手写项目可使用 `config.LoadProject(path, defaults, config.EnvOptions{Prefix:"MY_APP_"})`，或分别调用 `ApplyDefaults/DecodeFile/OverlayEnv`。读取失败不修改输入默认值；诊断不会打印输入值。不要主动打印含密钥的整个配置，或把底层解析错误展开到公开响应。Validate 不打开日志文件、数据库或存储连接；证书的可读性和握手信任在依赖初始化阶段验证。
-
-### 一次覆盖完整配置与 HTTP/日志短名称
-
-```go
-cfg, err = config.OverlayEnv(cfg, config.EnvOptions{
-    Prefix: "MY_APP_",
-    Empty: "reject", // allow / ignore / reject，项目自行选择
-    Aliases: config.ServerEnvAliases("MY_APP_", "server"),
-    // Lookup 可注入测试或项目配置源；默认 os.LookupEnv。
-})
-```
-
-不要再紧接着调用 `ApplyEnv(cfg.Server, ...)`。上面的调用同时处理完整配置和 HTTP_ADDR、SERVICE、LOG_LEVEL 等框架短名称。例如 `MY_APP_SERVER_ADDRESS` 与 `MY_APP_HTTP_ADDR` 指向同一字段，**完整名称优先**；未设置时才读取短名称。完整名称显式设空仍优先：allow 交给该字段解析（string 可清空；数字等仍要求合法值），ignore 保留文件/默认值，reject 报错。不会因 ignore 再退回别名。字段 `env` 标签的 empty 规则优先于全局规则。
-
-自定义别名用 `EnvOptions.Aliases`，键是完整环境名、值是按优先级排列的别名数组。两种名称都使用同一 Lookup、空值策略和类型转换；布尔 false、数值 0 与未设置不同。集合始终使用 JSON，包括 `MY_APP_TRUSTED_PROXIES='["127.0.0.1"]'`。
-
-新项目模板一次调用 OverlayEnv，默认 `Empty: "ignore"`。旧 `ApplyEnv` 保留原有忽略空值、修剪空白及 TRUSTED_PROXIES 逗号列表行为。已有项目的 `internal/config` 属于开发者文件，升级不覆盖它；按上例合并原来的两次覆盖调用后，保留项目自己的 Validate。日志输出的显式完整名称也优先于短名称。
+`go run . -config etc/config.test.yaml -check-config` 只校验，不打开日志、数据库或端口。生成/check/dry-run 保留业务文件；新的模板要求 v0.22。完整格式、错误定位、解析器与移除清单见 [CONFIG.md](CONFIG.md)。

 ## 依赖、日志与中间件

@@ -278,7 +249,7 @@ go-omni workspace check --file omni.workspace.json

 ## v0.13 项目升级

-先使用与目标框架匹配的 CLI；CLI 会提示与 go.mod 不同的版本。当前生成模板至少需要 v0.19.0-preview（或显式引用当前源码）。
+先使用与目标框架匹配的 CLI；CLI 会提示与 go.mod 不同的版本。当前生成模板至少需要 v0.22.0-preview（或显式引用当前源码）。

 ```sh
 go-omni api upgrade --dir . --dry-run
--- a/MODULES.md
+++ b/MODULES.md
@@ -6,6 +6,24 @@
 [examples/modules](examples/modules/README.md)。业务入口继续使用 `omni.New`，中间件依赖
 `httpx`，不依赖具体服务端网络实现。各模块按需创建、注入 Service，再注册到应用关闭流程。

+## 请求追踪与基础指标
+
+`omni.New()` 的默认链包含 RequestID、访问日志（可配置开关）和 Recovery；无需重复挂载。业务通过 `c.Context()` 传递 requestId，`logx.FromContext(ctx)` 取得该 App 的 Logger。手动组装 httpx 链时，也可使用 `middleware.RequestID("X-Request-ID")`、`middleware.AccessLog()` 和 `middleware.Recovery()`。
+
+轻量进程指标直接使用 `metrics`，无需 OTel collector：
+
+```go
+// import omni "git.yuntuo.hk/k2safe/go-omni"
+// import "git.yuntuo.hk/k2safe/go-omni/metrics"
+app := omni.New()
+measurements := metrics.New()
+app.Use(measurements.Middleware())
+app.GET("/metrics", measurements.Handler())
+// 也可以直接读取 measurements.Snapshot()。
+```
+
+记录请求数、失败数、处理中数量、累计耗时与 HTTP 状态分布；返回的是 JSON 快照，并非 Prometheus 文本格式。指标接口是否暴露以及访问权限由项目配置。需要 HTTP/SQL/Redis spans 和标准 OTel exporter 时，使用 [telemetry 示例](examples/platform/main.go)。需要跨域时配置 `server.cors`，由框架在路由与鉴权前处理预检；默认关闭。已有代理 CORS 可继续使用，避免两处重复设置。见 [CORS 配置与示例](cors/README.md)。
+
 ## 缓存：cache 与 cache/redis

 ```go
@@ -52,30 +70,26 @@ application.OnShutdown(client.Close)

 ```go
 client, err := httpc.New(httpc.Config{
-    Timeout: 3*time.Second, MaxRetries: 2, MaxConnsPerHost: 32,
-    MaxResponseBytes: 1 << 20,
+    Proxy: httpc.ProxyConfig{Mode: httpc.ProxyDirect},
+    Timeout: 3*time.Second, DialTimeout: time.Second,
+    TLSHandshakeTimeout: time.Second, ResponseHeaderTimeout: time.Second,
+    MaxConnsPerHost: 32, MaxIdleConnsPerHost: 16, MaxIdleConns: 64,
+    IdleConnTimeout: 60*time.Second, MaxResponseBytes: 1<<20,
 })
 if err != nil { return err }
 application.OnShutdown(client.Close)
-err = client.JSON(ctx, "GET", serviceURL, nil, &result)
+err = client.JSON(ctx, "GET", serviceURL, nil, &result,
+    httpc.WithHeader("Authorization", "Bearer "+token),
+)
 ```

-客户端应在服务启动时创建并复用。默认使用独立的 `net/http.Transport` 连接池，每个目标主机
-有连接上限；该上限不是整个进程的全局连接数上限。也可以注入自有 `http.RoundTripper`，
-其连接限制和生命周期由调用方负责。这样出站实现同样可以替换。
+启动时创建并复用 Client。代理可选环境、直连、固定地址；不配置时保留标准库原代理策略。JSON 支持单次请求头和响应限额，不保存 Client 全局 Token。新阶段超时与空闲连接参数可选，0 沿用默认。

-总超时覆盖建连、重试、等待和读取响应体。`Do` 返回后调用方必须读取/关闭 `response.Body`；
-`JSON` 自动关闭，并限制解码前读取的字节数。`Do` 允许流式读取，本身不限制响应体大小。
-`Close` 拒绝新请求、关闭自有池的空闲连接；在途请求应先排空。
+成功响应读取有界；output=nil 流式丢弃，不整体缓存。小错误体只在大小/时间预算内尝试读完以复用连接；未知或大错误体及时关闭。Do 保留标准流式 Request/Response，由调用者限量读取并关闭 body。Close 拒绝新调用并关闭自有池空闲连接，项目先排空在途工作。

-`MaxRetries` 默认 0，最多 5。封装只对可重放的 GET/HEAD/OPTIONS 重试网络错误及
-429/502/503/504；POST/PUT/PATCH/DELETE 不做应用层自动重试。标准库 Transport 和借用的
-RoundTripper 自身的重放规则仍生效，不能据此承诺“只执行一次”。退避带抖动，尊重
-`Retry-After`；服务器要求等待超过 `MaxBackoff` 时直接返回该响应，不提前重试。
-重定向交给业务处理，3xx 不会自动跟随。
+自定义 Transport 借用、不修改、不关闭；不能同时指定池/代理/阶段选项。总超时持续覆盖 HTTP 等待、重试和读取 body，但不抢占 JSON 编解码或不遵守 context 的自定义代码。MaxRetries 默认 0，只对可重放 GET/HEAD/OPTIONS 重试；3xx 不跟随。标准库和借用 Transport 自身仍可能重放，不能据此承诺业务只执行一次。

-默认从 context 传递 `X-Request-ID`，日志只包含方法、主机、状态、尝试次数和收到响应头的耗时，
-不记录完整 URL、查询参数、凭证和响应体。非 2xx 的 JSON 调用返回只带状态码的 `StatusError`。
+完整参数、NO_PROXY、TLS、安全日志、重试、签名兼容说明见 [httpc 指南](httpc/README.md)，可运行 [HTTP Client 示例](examples/httpClient/README.md)。

 ## 请求保护：middleware

--- a/PROJECT.md
+++ b/PROJECT.md
@@ -1,6 +1,6 @@
 # 生成项目与文件维护边界

-v0.19.0-preview 提供受管理的生成项目。安装同版远程 CLI，生成的项目直接引用该版本，无需本地 replace。根目录入口支持 `go run .` 和 `go build .`；框架本身仍然是可直接引用的库。安装和私有仓库访问见 [README](README.md#准备环境与安装)。
+v0.24.0-preview 提供受管理的生成项目。安装同版远程 CLI，生成的项目直接引用该版本，无需本地 replace。根目录入口支持 `go run .` 和 `go build .`；框架本身仍然是可直接引用的库。安装和私有仓库访问见 [README](README.md#准备环境与安装)。

 ## 创建和日常开发

@@ -38,7 +38,7 @@ ERROR [logicSignature] internal/logic/greet/greet.go:12 (GET /api/greet/:name):

 这是轻量源码分析，不运行项目 init、不执行 Go 命令、不下载依赖。项目自定义类型别名、嵌入方法或 build tags 等无法可靠判断时，会给 REVIEW 并交给 Go 编译器验证；不把这些情况强行判为签名错误。它不检查方法体是否引用已删除字段，也不证明业务逻辑正确。CI 中应同时执行 `go-omni api generate --check` 和 `go test ./...`，按项目实际构建参数测试。当前版本首次接手缺少快照的 manifest v2 时，会明确提示建立基线，不猜测旧契约；Logic 签名检查仍会执行。

-本版新增生成选项、公共字段组合和映射，详见 [生成能力指南](GENERATION.md)。
+生成选项、公共字段组合和可选 Go 拷贝工具，详见 [生成能力指南](GENERATION.md)。

 ## 哪些文件由用户维护

@@ -46,7 +46,8 @@ ERROR [logicSignature] internal/logic/greet/greet.go:12 (GET /api/greet/:name):
 | --- | --- |
 | `api/*.api` | 路由、DTO、具名中间件、响应模板、请求/响应模式 |
 | `etc/config.yaml` | 运行参数；密钥通过环境变量提供 |
-| `internal/config/config.go` | 自定义配置字段、加载、默认值与校验 |
+| `internal/config/config.go` | 自定义配置字段、默认值与校验 |
+| `internal/config/loader.go` | 需要额外文件格式时注册 Decoder |
 | `internal/svc/serviceContext.go` | 依赖字段和初始化，持有加载后的 Config |
 | `internal/svc/options.go` | AppOptions、GlobalMiddleware；注册 Go 错误目录和全局扩展 |
 | `internal/svc/databaseOptions.go` | 可选 MySQL 驱动与项目启动检查扩展 |
@@ -62,7 +63,7 @@ ERROR [logicSignature] internal/logic/greet/greet.go:12 (GET /api/greet/:name):

 以上骨架只补缺失文件，既有内容按字节保留。删除已废弃接口后，对应业务文件也不会被自动删除；由开发者整理编译器指出的失效类型或签名。

-生成器持续管理：`internal/svc/runtimeGen.go`、`main.go`、`internal/handler/*Gen.go`、分组的 `handlersGen.go`、`internal/types/*Gen.go`、中间件 `registryGen.go`、`docs/openapi.json`、`.goOmni/apiManifest.json`。如果在 `.api` 里选择声明错误，还会管理 `internal/apierrors/errorsGen.go`。文件标注 DO NOT EDIT；手改会被拒绝覆盖，需先移走自定义内容。
+生成器持续管理：`internal/config/loadGen.go`、`internal/svc/runtimeGen.go`、`main.go`、`internal/handler/*Gen.go`、分组的 `handlersGen.go`、`internal/types/*Gen.go`、中间件 `registryGen.go`、`docs/openapi.json`、`.goOmni/apiManifest.json`。如果在 `.api` 里选择声明错误，还会管理 `internal/apierrors/errorsGen.go`。文件标注 DO NOT EDIT；手改会被拒绝覆盖，需先移走自定义内容。

 Logic 实例在注册时创建并由请求并发复用；请求数据用方法参数和局部变量传递，不存入共享 Logic/svc 字段。

@@ -114,6 +115,8 @@ c.RequestShutdown(err)

 `Lifecycle *lifecycle.Controller` 是 svc 持有的通用控制器，初始化时创建，生成入口使用它的 Context。该 Context 表示服务正在停止，不代表数据库已经关闭。不能把它当作在途请求的 Context，也不要在它取消时立刻关闭请求仍依赖的资源。发号器失去租约后拒绝发号等业务安全规则仍由项目实现。

+配置加载入口 `internal/config/loadGen.go` 也由生成器维护。业务扩展 Config/Default/Validate；只有新格式才需要修改 NewLoader。JSON/YAML/XML、错误定位和旧 Load 迁移见 [配置指南](CONFIG.md)。
+
 ## 配置内置接口

 生成项目在 `etc/config.yaml` 明确列出以下默认配置；可以独立关闭、修改路径，或让健康接口返回原始 JSON：
@@ -140,7 +143,7 @@ server:

 `responseMode: raw` 返回 `{"status":"ready"}` 等健康数据，有依赖时包含检查名称、结果与耗时；不包装公共体。存活检查不执行依赖探针；服务开始退出后，就绪检查返回 503，存活仍可返回 200，直到监听关闭。OpenAPI 始终输出规范文档本身，不使用业务响应包装；关闭 HTTP 文档端点不影响生成 `docs/openapi.json`。

-环境变量覆盖配置文件，例如 `GO_OMNI_ENDPOINTS_READINESS_PATH=/readyz`、`GO_OMNI_ENDPOINTS_READINESS_RESPONSE_MODE=raw`、`GO_OMNI_ENDPOINTS_OPENAPI_ENABLED=false`；liveness/readiness/openapi 都支持对应的 ENABLED 和 PATH。Config/AppOptions 的最终有效配置决定是否注册。
+内置路由配置由项目文件明确设置，也可以使用 `${NAME:-fallback}` 引用；不再按字段名自动读取环境变量。Config/AppOptions 的最终有效配置决定是否注册。

 关闭或改名后，旧路径不再由框架保留，项目可以在 `.api` 自己声明。启用的内置 GET 路由与业务路由相同或被业务参数/通配路径覆盖时，在创建 App、开始监听之前报错；不会覆盖业务路由。内置接口仍经过全局中间件；项目在鉴权中间件中明确决定这些路径的访问规则，框架不自动绕过鉴权。

@@ -212,7 +215,7 @@ get /download (DownloadReq)

 ## 已有服务接入步骤

-每个独立服务生成一个项目，module 名称、上层目录和共享业务包由项目选择。接入时固定 CLI 与框架版本为 v0.19.0-preview：
+每个独立服务生成一个项目，module 名称、上层目录和共享业务包由项目选择。接入时固定 CLI 与框架版本为 v0.24.0-preview：

 1. 先保留旧服务，整理实际路由及现有响应、鉴权和超时要求。在新目录执行 `go-omni new --api /path/to/service.api --module example.com/service ./service`；不对旧入口强制覆盖。
 2. 在 `.api` 中选择 `@app(defaultResponse: ...)`，显式保留原项目的字段、成功码、错误码和 `dataMode`。需要独立回执的路由单独声明 raw/produces。普通路由、404/405 和提前返回的中间件一起验收。
--- a/README.md
+++ b/README.md
@@ -2,7 +2,11 @@

 GoOmni 是面向多个业务项目复用的 Go 后端框架：用 `.api` 定义接口、请求和返回类型，生成项目目录、HTTP 接入代码及 OpenAPI，业务代码负责 Logic 和 Repository。也可以在已有项目中直接使用 `omni.New()`，或单独引入日志、存储等模块。

-**从这份 README 开始接入。** 当前版本 **`v0.19.0-preview`**，新生成项目采用根目录入口和 `config / svc / logic / handler`。可以固定版本开展业务接入；文件维护边界和已有服务迁移步骤见 [项目指南](PROJECT.md)，版本变化与验收见 [发布说明](RELEASE.md)。
+**从这份 README 开始接入。** 当前版本 **`v0.24.0-preview`**，新生成项目采用根目录入口和 `config / svc / logic / handler`。可以固定版本开展业务接入；文件维护边界和已有服务迁移步骤见 [项目指南](PROJECT.md)，版本变化与验收见 [发布说明](RELEASE.md)。
+
+**v0.24 改动**：新增可选 CORS，生成项目通过 `server.cors` 自动接入，支持预检、错误响应和明确的来源白名单；默认关闭。[配置与规则](cors/README.md)、[可运行示例](examples/cors/README.md)。
+
+**v0.23 改动**：配置校验定位具体字段和安全原因；`httpc.JSON` 可选限制成功状态；`copyx.Check` 无需样本预检类型；`logx` 支持实例独立时区。[四项完整示例](examples/developerTools/README.md)。

 **v0.19 改动**：新增可选 `copyx` 工具，用普通 Go 调用完成浅拷贝、深拷贝和显式类型转换；深拷贝会拒绝自定义转换中残留的源对象可变引用。**移除了 `mappings` / `mappingFiles` 和映射代码生成**，已有使用者须按 [迁移步骤](COPY.md#从旧-mapping-迁移) 调整，不能直接删除仍在调用的旧文件。

@@ -12,9 +16,9 @@ Go **1.22+**。框架不依赖 Gin，默认使用标准库网络层，提供可

 响应字段、业务码、登录方式、权限规则和数据库表结构由接入项目决定。文中的 `code/msg/data`、`200/9999` 都是示例配置，可以替换。

-契约支持 `returns([]string/[]int64/[]bool/[]any)`、OpenAPI 公共引用、workspace 一次导出共享 Go 错误目录，以及统一环境变量别名覆盖。详细配置与升级步骤见 [业务开发指南](DEVELOPMENT.md)。
+契约支持 `returns([]string/[]int64/[]bool/[]any)`、OpenAPI 公共引用、workspace 一次导出共享 Go 错误目录，以及文件显式环境引用与配置检查。详细配置与升级步骤见 [业务开发指南](DEVELOPMENT.md)。

-已有通用开发能力见 [业务开发指南](DEVELOPMENT.md)：数组/null、严格请求策略、声明式上传、完整配置环境覆盖、资源生命周期、共享契约和升级工具。MySQL 直接使用 [官方适配器](database/mysql/README.md)。
+已有通用开发能力见 [业务开发指南](DEVELOPMENT.md)：数组/null、严格请求策略、声明式上传、文件显式配置引用、资源生命周期、共享契约和升级工具。MySQL 直接使用 [官方适配器](database/mysql/README.md)。

 后台组件可在 svc 登记 [分阶段关闭](lifecycle/README.md#后台组件分阶段关闭)，先停止接收工作并等待收尾，再关闭共享资源；无需绑定队列或 ORM。

@@ -31,29 +35,102 @@ Go **1.22+**。框架不依赖 Gin，默认使用标准库网络层，提供可
 | 中间件依赖工厂、可选 Repository | `omni.gen.json` 选择 factories / none；在 `New<Name>(deps)` 写一次实现 | [配置与完整工厂示例](GENERATION.md) |
 | 路由、分组、请求上下文 | `omni.New()`、`app.GET` / `Group` / `Use`；业务使用 `context.Context` | [基本服务](examples/basic/main.go)、[已有项目接入](#已有项目按模块接入) |
 | HTTP 网络与扩展适配 | 配置 transport 为 nethttp / native / http2；自定义 Router/Runner | [网络层配置与契约](transport/README.md)、[性能与限制](PERFORMANCE.md) |
+| 浏览器跨域 CORS | `server.cors` / `omni.WithCORS`；独立 HTTP 用 `cors.New(...).Wrap(handler)` | [配置、默认值与协议边界](cors/README.md)、[鉴权与预检示例](examples/cors/README.md) |
 | HTTP 老接口桥接 | 通过官方 Handler/Middleware 适配器接入标准 `net/http`，跟踪实际响应状态 | [接入说明](MIGRATION.md)、[桥接/上传/自定义 ID 示例](examples/compatibility/main.go) |
 | 请求校验、动态 JSON、自定义标量 | `.api` 声明来源/校验/scalar；手写契约用 `contract.New[T]`；简单绑定可用 `validate.JSON/Query/URI` | [语法与例子](API.md)、[请求策略](DEVELOPMENT.md) |
 | 数组、null、原始请求、上传下载 | `.api` 声明数组/可空返回、body/multipart 与大小限制；必要时使用 Bind/Manual 扩展 | [契约示例](examples/contracts)、[含上传/回调/下载的项目](examples/managedService/README.md) |
 | 公共响应与特殊协议 | `.api` 定义 response 并 `@app(defaultResponse: ...)`；Go 用 `WithResponse` / Encoder | [响应配置](RESPONSE.md)、[响应模板契约](examples/contracts/responses.api) |
 | 错误目录与动态提示 | `WithErrors(catalog)` 注册一次；`ByCode(...).WithParams(...).WithCause(err)` | [错误目录](errors/README.md)、[模板参数示例](examples/contracts/errorParams.api) |
 | OpenAPI 与错误公共引用 | `.api` 自动生成；手写接口可使用 `openapi` 注册器；Go 错误目录显式导出 | [契约工具](DEVELOPMENT.md)、[注册示例](examples/platform/main.go) |
-| 结构化业务日志 | `logx.Info/Error`、`logx.From(ctx)`、`logx.New`；支持轮转、脱敏、慢请求和级别更新 | [下方日志示例](#日志)、[完整配置](logx/README.md) |
-| 文件配置与环境覆盖 | 默认值→JSON/YAML→环境；完整业务结构用 `config.LoadProject[T]` / 环境别名 | [配置详解与例子](DEVELOPMENT.md)、[动态级别](ADVANCED.md#配置与日志热更新) |
+| 结构化业务日志 | `logx.Info/Error`、`logx.FromContext(ctx)`、`logx.New`；支持独立时区、轮转、脱敏、慢请求和级别更新 | [下方日志示例](#日志)、[完整配置](logx/README.md) |
+| 文件配置与环境引用 | Default()→JSON/YAML/XML 字段引用→类型绑定→校验；无隐式覆盖，支持 `-check-config` | [统一配置指南](CONFIG.md)、[完整可运行示例](examples/configuration/README.md)、[动态级别](ADVANCED.md#配置与日志热更新) |
 | 生命周期与健康检查 | svc 登记 OnClose/OnStop/OnDrain，RequestShutdown 通知故障；健康路径/开关可配 | [生命周期用法](lifecycle/README.md)、[健康检查](health/README.md)、[生成项目扩展](PROJECT.md) |
 | 数据库、连接池与事务 | `database.Open` / `OpenConnector`；事务与检查由项目显式调用 | [通用数据库](database/README.md)、[MySQL TLS/Logger](database/mysql/README.md) |
 | 可选 GORM 与迁移 | gormx 复用已有连接池；`go-omni migrate` 预览，显式 apply | [GORM 示例](database/gormx/README.md)、[迁移用法](ADVANCED.md#迁移审计与分页) |
 | 认证与权限接口 | 注入 Authenticator / Policy；JWT 或 Session 只是可选实现 | [认证说明](auth/README.md)、[鉴权完整例子](examples/platform/README.md) |
 | 缓存 | `cache.NewMemory` 或 Redis 实现；业务面向 Store 的 Get/Set/Delete | [缓存配置/代码](MODULES.md)、[可运行模块服务](examples/modules/README.md) |
-| 出站 HTTP、熔断 | `httpc.New` 复用连接池与截止时间；`resilience.New` 隔离故障依赖 | [HTTP 用法](MODULES.md)、[熔断/观测](ADVANCED.md#熔断与观测) |
-| CORS、日志、恢复、限流、幂等、超时 | `app.Use(...)` 按需组合 middleware；跨副本选择 Redis 实现 | [模块说明与限制](MODULES.md)、[分布式实现](ADVANCED.md#分布式限流与幂等) |
+| 出站 HTTP、熔断 | `httpc.New` 配置代理、连接池和阶段超时；JSON 支持单次成功状态限制/请求头/限额；`resilience.New` 隔离故障 | [HTTP 完整用法](httpc/README.md)、[可运行示例](examples/httpClient/README.md)、[熔断/观测](ADVANCED.md#熔断与观测) |
+| 请求追踪、访问日志、恢复、限流、幂等、超时 | `app.Use(...)` 按需组合 middleware；跨副本选择 Redis 实现 | [模块说明与限制](MODULES.md#请求追踪与基础指标)、[分布式实现](ADVANCED.md#分布式限流与幂等) |
 | 本地后台任务与调度 | `task.New`、Submit、Every；有界队列、排空关闭 | [task 示例与生命周期](MODULES.md#后台执行task) |
 | 持久队列 | 业务使用 Publisher / Consumer；Redis Streams 提供至少一次交付 | [队列初始化/消费示例](ADVANCED.md#可靠队列) |
 | 文件存储、直传、云端分片 | Store 的 Put/Get/Delete；Local、S3/R2、OSS 按配置装配；扩展接口提供分片续传 | [存储接口与完整例子](storage/README.md)、[本地存储服务](examples/platform/README.md) |
-| 日志关联、指标与链路 | `metrics.New().Middleware()`；telemetry 注入 OTel exporter/reader | [观测用法](ADVANCED.md#熔断与观测)、[完整接入](examples/platform/main.go) |
+| 日志关联、指标与链路 | `metrics.New().Middleware()`；telemetry 注入 OTel exporter/reader | [基础指标](MODULES.md#请求追踪与基础指标)、[OTel 用法](ADVANCED.md#熔断与观测)、[完整接入](examples/platform/main.go) |
 | 审计与分页 | `audit.New` 注入 Sink/白名单；`pagination.Parse` / `NewResult` | [解释与调用例子](ADVANCED.md#迁移审计与分页) |
-| 可选结构转换与深拷贝 | `copyx.Copy` / `Clone` / `New`；Go converter 处理差异 | [下方示例](#可选结构转换与深拷贝)、[完整 copyx 指南](COPY.md)、[可运行代码](examples/copying) |
+| 可选结构转换与深拷贝 | `copyx.Copy` / `Clone` / `New`；`Check[S,T]` 预检类型，Go converter 处理差异 | [下方示例](#可选结构转换与深拷贝)、[完整 copyx 指南](COPY.md)、[可运行代码](examples/copying) |
 | 自定义适配器验收 | `transporttest.Run`、`storagetest.Run` / `RunUploads` 验证扩展契约 | [网络契约测试入口](transport/transporttest/router.go)、[存储契约测试入口](storage/storagetest/contract.go) |

+## 浏览器跨域 CORS
+
+同源部署保持默认关闭；需要跨域时，在生成项目的配置文件中加入：
+
+```yaml
+server:
+  cors:
+    enabled: true
+    allowedOrigins: [https://admin.example.com, https://merchant.example.com]
+    allowedMethods: [GET, HEAD, POST, PUT, PATCH, DELETE]
+    allowedHeaders: [Authorization, Content-Type]
+    exposedHeaders: [Content-Disposition, X-Request-ID]
+    allowCredentials: false
+    maxAge: 10m
+```
+
+不需要修改 main、Logic 或 `.api`。框架在鉴权前处理合法预检；实际请求仍鉴权，401/404/405/500 保持项目响应格式并附带允许来源的跨域头。没有 Origin 的服务端回调正常处理。配置只决定浏览器读取权限，不替代登录、验签或 CSRF 防护。
+
+手写项目用 `omni.WithCORS(omni.CORSConfig{...})`，独立 HTTP 服务用 `cors.New(...).Wrap(handler)`；代理已经处理 CORS 时保持关闭。完整 [默认值与边界](cors/README.md)、[可运行示例](examples/cors/README.md)。
+
+## 带认证的出站 HTTP
+
+HTTP Client 在 svc 初始化一次，业务重复使用。普通内部请求可直接选择直连和连接参数，无需手写 Transport：
+
+```go
+client, err := httpc.New(httpc.Config{
+    Proxy: httpc.ProxyConfig{Mode: httpc.ProxyDirect},
+    Timeout: 3*time.Second, DialTimeout: time.Second,
+    TLSHandshakeTimeout: time.Second, ResponseHeaderTimeout: time.Second,
+    MaxConnsPerHost: 32, MaxIdleConnsPerHost: 16, MaxIdleConns: 64,
+})
+if err != nil { return err }
+// 在 svc 生命周期登记 client.Close；关闭前先排空使用它的工作。
+err = client.JSON(ctx, "GET", endpoint, nil, &result,
+    httpc.WithHeader("Authorization", "Bearer "+token),
+    httpc.WithMaxResponseBytes(64<<10),
+)
+```
+
+请求头只作用于本次调用，不把用户 Token 留在共享 Client。默认代理/参数保持原行为；也可选择环境代理或固定代理。JSON 自动关闭并限制响应，Do 保留下载/流式读取扩展。完整配置、重试边界和已有自定义 Transport 的迁移见 [httpc](httpc/README.md)。
+
+```sh
+go run ./examples/httpClient
+```
+
+## 统一配置加载
+
+业务只维护 Config、Default()、Validate() 和配置文件。生成器维护 Load/main；文件缺失字段保留默认值，显式 0/false/空字符串正常覆盖，固定值不会被同名环境变量再次覆盖。
+
+```go
+BatchSize int `json:"batchSize"` // 加入 Config；在 Default() 中设置 BatchSize: 100。
+```
+
+```yaml
+server:
+  address: "${HTTP_ADDR:-127.0.0.1:8080}"
+batchSize: "${BATCH_SIZE:-100}"
+password: "${DB_PASSWORD}"
+sessionToken: "${SESSION_TOKEN:-}"
+```
+
+`${NAME}` 未设置或为空就报错；`${NAME:-value}` 明确指定备用值。`$$` 转义 `$`；密码中的冒号、换行、引号和 `${...}` 原样插入，不二次解释。JSON/YAML/XML 共用解析后的字段处理和 Go 类型绑定，错误同时定位文件、字段、变量及可用行列，不打印原值。
+
+```sh
+go run ./examples/configuration -format xml
+DEMO_CLIENT_TIMEOUT=500ms go run ./examples/configuration
+# 在生成项目中，仅检查选中的文件，不初始化依赖：
+go run . -config etc/config.test.yaml -check-config
+```
+
+完整 [语义与迁移](CONFIG.md)、[可运行示例](examples/configuration/README.md)。**v0.22 移除旧自动环境覆盖、前缀/别名及 env/envDefault 标签**，生成项目先迁移开发者配置再重新生成；文件中的响应模板 `${code}` 写成 `$${code}`，`.api` 保持原样。
+
 ## 选择接入方式

 | 你的项目 | 从哪里开始 |
@@ -74,7 +151,7 @@ module 地址是 `git.yuntuo.hk/k2safe/go-omni`。先确保本机 Go 和 Git 可

 ```sh
 export GOPRIVATE="$(go env GOPRIVATE),git.yuntuo.hk"
-go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.19.0-preview
+go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.24.0-preview
 export PATH="$(go env GOPATH)/bin:$PATH"
 go-omni --help
 ```
@@ -231,7 +308,7 @@ go-omni new --api catalog.api \
 在业务项目的 **go.mod 所在目录**执行：

 ```sh
-go get git.yuntuo.hk/k2safe/go-omni@v0.19.0-preview
+go get git.yuntuo.hk/k2safe/go-omni@v0.24.0-preview
 ```

 已有项目可直接复用现有目录、Service、Repository 和数据库连接，先选择一个接口接入。也可以只用 `logx`、`storage` 等包，暂时保留原来的 HTTP 框架。希望入口和 HTTP 接入都交给生成器的项目，按 [已有服务接入步骤](PROJECT.md#已有服务接入步骤) 在新目录生成后迁入业务代码。
@@ -457,6 +534,28 @@ if err := copier.Copy(&view, input); err != nil { return err }

 自定义函数的源/目标类型由 Go 泛型确定。深拷贝时返回原指针、原 map、子切片或嵌套旧引用都会报错；字符串/整数原值可以返回。差异规则、nil 策略、字段覆盖、资源限制和原 mapping 移除步骤见 [copyx 指南](COPY.md)，完整类型及可运行代码见 [examples/copying](examples/copying/main.go)。工具使用运行时检查，类型对需测试；深拷贝不适用于连接、锁等资源。

+### 减少接入代码：四个常用入口
+
+```yaml
+server:
+  log:
+    timeZone: Asia/Shanghai
+```
+
+时区由 Logger 实例管理，不修改全局 `time.Local`。非法日志级别、数据库端口/连接池等配置会指出 `server.log.level`、`database.port` 等字段和原因，不打印输入值。详见 [配置诊断](CONFIG.md#框架模块的字段诊断)、[日志时区](logx/README.md#实例时区)。
+
+```go
+// 本次请求只接受 HTTP 200；默认仍接受所有 2xx。
+err := client.JSON(ctx, http.MethodGet, url, nil, &result,
+    httpc.WithSuccessStatuses(http.StatusOK),
+)
+
+// CI/启动时检查类型，无需构造样本；仍使用 Copy 的同一组 Option。
+err = copyx.Check[Request, BusinessInput](options...)
+```
+
+状态不符合要求返回 `*httpc.StatusError`，不会写入 result，响应体仍由框架关闭。Check 不执行 converter；动态 interface、具体 nil/转换失败和深拷贝引用检查有明确边界，见 [类型预检](COPY.md#类型预检)。完整可运行代码见 [developerTools](examples/developerTools/README.md)。
+
 ### 数据库、存储及其他模块

 生成项目在 `internal/svc` 中创建依赖，提供给 Logic/Repository，并用 `c.OnClose(db.Close)` 登记自有资源。生成的 main 在 HTTP 排空后关闭 svc，再关闭日志。直接使用框架的手写项目则可以用 `app.OnShutdown(db.Close)`；不要对同一资源重复登记。
@@ -475,20 +574,22 @@ API 项目的数据库迁移需要单独维护并显式执行；启动不会自

 ## 配置与运行

-生成项目从 `etc/config.yaml` 读取配置，优先级为 **默认值 → 配置文件 → 环境变量**。密钥通过环境变量提供。手写入口需显式调用配置加载函数并传给 `omni.New(omni.WithConfig(settings))`；单独调用 `omni.New()` 不会自动读取环境变量。
+生成项目使用 **Default() → 选定文件的显式引用 → 类型绑定 → Validate()**。固定值不会被环境变量覆盖；配置规则、转义及迁移见 [配置指南](CONFIG.md)。手写入口显式加载配置，再传入 `omni.New(omni.WithConfig(settings))`。

-| 环境变量 | 用途 |
+| 文件字段 | 用途 |
 | --- | --- |
-| `GO_OMNI_HTTP_ADDR` | 监听地址；生成项目默认 `127.0.0.1:8080` |
-| `GO_OMNI_TRANSPORT` | `nethttp`（默认）、`native`、`http2` |
-| `GO_OMNI_TLS_CERT_FILE` / `GO_OMNI_TLS_KEY_FILE` | 成对设置 TLS 证书和私钥路径 |
-| `GO_OMNI_HTTP_READ_HEADER_TIMEOUT` / `GO_OMNI_HTTP_READ_TIMEOUT` | 请求头 / 请求读取超时，如 `5s` / `30s` |
-| `GO_OMNI_HTTP_WRITE_TIMEOUT` / `GO_OMNI_HTTP_IDLE_TIMEOUT` | 响应写入 / Keep-Alive 空闲超时 |
-| `GO_OMNI_HTTP_MAX_HEADER_BYTES` | 请求头大小限制，字节数 |
-| `GO_OMNI_SHUTDOWN_TIMEOUT` | 优雅退出等待时间，默认 `10s` |
-| `GO_OMNI_ENABLE_LOGGER` / `GO_OMNI_LOG_LEVEL` | 访问日志开关、日志级别 |
-| `GO_OMNI_TRUSTED_PROXIES` | 可解析转发地址头的可信代理 IP/CIDR，逗号分隔 |
-| `GO_OMNI_DB_HOST/USER/PASSWORD/DATABASE` | 官方 MySQL 适配器的结构化连接配置 |
+| `server.address` | 监听地址，生成项目默认 127.0.0.1:8080 |
+| `server.transport` | nethttp（默认）、native、http2 |
+| `server.tls.certFile/keyFile` | 成对配置 TLS 证书和私钥路径 |
+| `server.http.readHeaderTimeout/readTimeout` | 请求头 / 请求读取超时 |
+| `server.http.writeTimeout/idleTimeout` | 响应写入 / Keep-Alive 空闲超时 |
+| `server.http.maxHeaderBytes` | 请求头大小限制，字节数 |
+| `server.shutdownTimeout` | 优雅退出等待时间，默认 10s |
+| `server.enableLogger` / `server.log.level` | 访问日志开关、日志级别 |
+| `server.trustedProxies` | 可信代理 IP/CIDR，文件数组 |
+| `database.host/user/password/database` | 官方 MySQL 结构化连接配置 |
+
+初始生成文件已为地址、网络层和选中模块的必要配置声明环境引用；其他字段按需要添加固定值或引用。

 例如在生成项目中切换 native：

@@ -533,7 +634,7 @@ go test ./...

 `main.go`、`Gen.go`、`docs/openapi.json` 和 manifest 由生成器管理，手动修改会报告冲突。Logic、Repository、中间件实现、配置和依赖装配属于项目，重复生成保留手写内容。契约变化会提示受影响的 Logic 文件和 DTO 字段，明确的签名错误会给出原签名与期望签名；生成后 `--check` 仍能检出未修复的问题。将 `.api`、`omni.gen.json`、生成文件和 `.goOmni/apiManifest.json` 一起提交，CI 同时运行 `generate --check` 与 `go test ./...`。详见 [契约变更提示与检查边界](PROJECT.md#契约变更提示)。

-CLI 与业务 module 固定使用 `v0.19.0-preview`。v0.14.x 项目升级依赖与 CLI 后重新生成，框架维护的 main/runtimeGen 自动更新；v0.13 及更早项目按 [升级预览](DEVELOPMENT.md#v013-项目升级) 处理，不直接覆盖手写入口或业务文件。使用过旧 mapping 的项目必须先完成 [移除迁移](COPY.md#从旧-mapping-迁移)，旧配置或旧生成文件会阻止生成。升级后执行生成检查与业务回归。版本变化、迁移边界和验收记录见 [发布说明](RELEASE.md)。
+CLI 与业务 module 固定使用 `v0.24.0-preview`。v0.21 及更早项目先按 [配置迁移](CONFIG.md#v022-迁移旧模式已移除) 整理旧标签、文件与 Load，再升级依赖与 CLI 并重新生成，框架维护的 main/runtimeGen 自动更新；v0.13 及更早项目按 [升级预览](DEVELOPMENT.md#v013-项目升级) 处理，不直接覆盖手写入口或业务文件。使用过旧 mapping 的项目必须先完成 [移除迁移](COPY.md#从旧-mapping-迁移)，旧配置或旧生成文件会阻止生成。升级后执行生成检查与业务回归。版本变化、迁移边界和验收记录见 [发布说明](RELEASE.md)。

 ## 按需深入

--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,4 +1,124 @@
-# v0.19.0-preview
+# v0.24.0-preview
+
+业务项目通过配置开启跨域，不需要手写 OPTIONS Handler 或逐条修改接口。
+
+- 默认关闭，在 `server.cors` 显式配置来源、方法和请求头；统一文件加载、环境引用和字段级诊断自动生效。生成项目无需修改 main、svc 或 `.api`。
+- 预检在鉴权前返回 204/403 空响应；实际请求继续鉴权、业务错误编码和路由处理。允许来源可读取 401/403/404/405/500，上传下载和流式能力保留。
+- 只支持精确 HTTP(S) 来源，公开无凭据服务可配置单一 `*`；禁止 `*` 与凭据混用。配置初始化快照、请求并发隔离、Vary 缓存分流和有界请求头处理。
+- 同一个 App 策略覆盖标准库、native 和 HTTP2；独立服务可使用 `cors.New(...).Wrap(handler)`。没有新增第三方依赖，没有移除现有功能。
+
+```sh
+go get git.yuntuo.hk/k2safe/go-omni@v0.24.0-preview
+go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.24.0-preview
+go-omni api generate
+go-omni api generate --check
+go run . -config etc/config.yaml -check-config
+```
+
+现有项目不配置 CORS 时行为不变。代理已处理 CORS 的项目继续关闭；跨域不替代登录、权限或 CSRF 防护。通过 App/Engine/Run 接入，直接对外暴露底层 Router 会绕过应用外层策略。本轮新增 runtime 配置需 v0.24，未使用该配置的模板最低版本仍为 v0.22。
+
+[配置与规则](cors/README.md)、[可运行示例](examples/cors/README.md)、[验收与性能](reports/corsAcceptance.md) 已同步。49 个测试包全量 race、Go 1.22、vet/build、实际生成项目、三种 transport 的 TLS 场景和 20 项真实浏览器检查通过；30 秒 fuzz 约 288 万次。当前仍为 preview。
+
+---
+
+# v0.23.0-preview（历史版本）
+
+减少业务接入时重复维护的配置校验、HTTP 包装和类型检查。
+
+- 配置诊断定位 database.port、database.pool.maxIdleConns、server.log.level/timeZone 等具体字段，保留文件、环境变量、行列和安全原因；凭据不进入公开提示，原始原因可 errors.Is/As。
+- JSON 可传 `httpc.WithSuccessStatuses(200)`，默认仍接受全部 2xx；不匹配时不改目标，继续负责有界读取、关闭和连接回收，不添加新的重试规则。
+- `copyx.Check[S,T](options...)` 或已有 Copier.Check 复用同一组 Go 选项，无需样本和映射文件；实际拷贝不再因集合为空而漏过确定的类型不匹配。动态 interface、nil 值、converter 失败及深拷贝共享引用仍有运行时检查。
+- `server.log.timeZone: Asia/Shanghai` 配置实例时区；JSON/text/子日志一致，业务 time.Time 属性保持原样。极简镜像可用 `go build -tags timetzdata .` 内置时区数据，库不强制增加体积。
+
+```sh
+go get git.yuntuo.hk/k2safe/go-omni@v0.23.0-preview
+go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.23.0-preview
+go-omni api generate
+go-omni api generate --check
+go run . -config etc/config.yaml -check-config
+```
+
+现有调用接口保留；配置错误文本现在更精确，业务应通过类型/字段识别错误。空集合里确定的类型错误会提前暴露，需要显式 converter 或调整实际类型，不应靠空值跳过校验。预检通过不代表 converter 对所有业务值必定成功。当前模板最低版本仍是 v0.22，本轮新增 runtime 能力需使用 v0.23。
+
+[完整示例](examples/developerTools/README.md)、[配置](CONFIG.md)、[JSON 选项](httpc/README.md)、[类型预检](COPY.md#类型预检)、[日志时区](logx/README.md#实例时区)。验收与性能记录见 [本轮验收](reports/developerToolsAcceptance.md)。仍为 preview。
+
+48 个测试包全量 race、Go 1.22、vet/build、实际生成消费者及约 392 万次 copyx fuzz 通过。空缓存安装远程版本后，66 项发布检查通过，包括下载模块的 config/httpc/copyx/logx race；耗时 57.06 秒，无本地 replace。标签固定在 `3bbc6f60d76cb9eae6f01fa6ca122eb1fbf481af`，见 [远程验收](reports/developerToolsRemote.json)。
+
+---
+
+# v0.22.0-preview（历史版本）
+
+配置文件明确决定每个值的来源，项目只维护 Config、Default()、Validate() 和文件。
+
+- `${NAME}` 必填，`${NAME:-fallback}` 在未设置/空字符串时使用备用值，`$$` 转义 `$`。支持字符串组合；环境值不二次展开，凭据空格和特殊字符原样保留。
+- 在 JSON/YAML/XML 已解析的字段值上展开，再按目标 Go 类型绑定；缺失字段保留默认值，0/false/空字符串可显式覆盖。字段错误定位文件、环境名和可用行列，不回显值。
+- 生成 Load/main 自动接入；新增 `-check-config`，选定一个文件检查，成功退出，不启动日志/依赖/监听。精简生成配置，重新生成保留业务 Config、Default、Validate 和文件。
+- **不兼容变更：旧自动环境覆盖、前缀/别名、env/envDefault、database.ConfigFromEnv/ApplyEnv 已移除。** LoadFile/NewReloader 不再接收 prefix，omni.LoadConfig 参数改为文件路径。发现旧标签提示迁移。
+- 配置文件中的响应模板用 `$${code}` 等转义；`.api` 中的 `${code}` 不变。日志 file/output/rotation 均由显式文件配置决定，不再隐式清除。
+
+```sh
+go get git.yuntuo.hk/k2safe/go-omni@v0.22.0-preview
+go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.22.0-preview
+# 按 CONFIG.md 迁移开发者配置后：
+go-omni api generate
+go-omni api generate --check
+go run . -config etc/config.yaml -check-config
+```
+
+[完整规则与迁移](CONFIG.md)、[可运行示例](examples/configuration/README.md)、[场景与性能验收](reports/explicitConfigurationAcceptance.md) 已同步。48 个测试包全量 race、实际生成消费者、Go 1.22、vet/build 和约 28 万次引用 fuzz 通过；小配置固定值/带引用加载约 25 µs，属于本机启动阶段基准。当前仍为 preview。
+
+空缓存远程 CLI 安装、下载模块 config/httpc race、8 组实际生成消费者与 `-check-config` 验收通过，无本地 replace。标签固定在 `d598b2ebee8cde36859021e882a6bc1e0bb4fd4c`；见 [远程验收记录](reports/explicitConfigurationRemote.json)。
+
+---
+
+# v0.21.0-preview（历史版本）
+
+让带认证的 HTTP 调用和内部直连可以直接使用 httpc，减少手写 Transport 与 JSON 响应处理。
+
+- Proxy 支持环境、直连、固定代理；默认保留既有策略。
+- 建连、TCP keepalive、TLS 握手、响应头、100-continue、空闲超时和独立空闲连接数量可选配置；不修改全局 Transport，不关闭借用实例。
+- JSON 支持 WithHeader / WithHeaders / WithMaxResponseBytes；认证信息逐请求隔离，自动关闭和有界响应处理保留。
+- 成功路径减少请求复制和无用退避；output=nil 按限额流式丢弃；小错误体在大小和时间预算内尝试复用连接。
+- 不新增依赖、不增加业务规则；Do 保留标准流式扩展。CLI 最新版本与模板最低版本分开，本轮模板兼容门槛仍是 v0.20。
+
+```sh
+go get git.yuntuo.hk/k2safe/go-omni@v0.21.0-preview
+go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.21.0-preview
+```
+
+**兼容注意**：JSON 旧的直接调用仍有效，自定义 interface/函数值需要同步新增的 variadic 参数。自定义 Transport 与显式连接/代理/阶段参数混用现在报错，避免参数被忽略；迁移时在自己的 Transport 配置，或改用内置字段。没有删除原调用入口。
+
+[参数与使用说明](httpc/README.md)、[可运行示例](examples/httpClient/README.md)、[场景与性能验收](reports/httpcAcceptance.md) 已同步到 README。48 个测试包全量 race、Go 1.22 兼容、vet/build、约 110 万次请求头 fuzz 通过。性能来自本机同条件基准，不能代替项目实际流量验证；仍为 preview。
+
+空缓存远程安装、下载模块的 httpc race 与示例、8 组生成消费者验收通过，无本地 replace。标签固定在 `96e7d9629b5c8b78e9cfefbcb05da0ab702c242b`，见 [远程记录](reports/httpcRemote.json)。
+
+---
+
+# v0.20.0-preview（历史版本）
+
+统一配置加载，减少生成项目重复维护的启动代码。
+
+- 生成器维护 `internal/config/loadGen.go`，调用 `config.LoadProject`；项目只扩展 Config/Default/Validate，可选在 loader.go/NewLoader 注册新格式。入口、环境覆盖、日志输出规范化无需业务重复实现。
+- JSON/YAML/XML 使用同一个加载与绑定流程；Decoder 通过实例注册，无全局 init 或额外强制依赖。内置格式、字段、文件大小与层数均有明确限制。
+- `config.Error` 携带文件、字段、环境变量、可用行列及安全原因；`Invalid` / `AtField` 支持业务验证。保留内部错误链，不自动输出原值；大整数、空集合、null、默认值隔离和自定义反序列化有回归覆盖。
+- 配置解析在日志、依赖和监听初始化之前；生成/check/dry-run 使用一致入口和文件所有权规则。
+- **迁移要求：旧项目先整理手写 Load，再重新生成。** 不静默覆盖业务文件。低层配置 API 保留；新项目不再复制手写加载流程。固定 Go 数组严格检查长度，YAML alias/merge/custom tag 不再接受，避免模糊覆盖和扩展行为。
+
+```sh
+go get git.yuntuo.hk/k2safe/go-omni@v0.20.0-preview
+go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.20.0-preview
+# 先按 CONFIG.md 迁移旧 Load，再执行：
+go-omni api generate
+go-omni api generate --check
+go test ./...
+go build .
+```
+
+完整用法、格式、脱敏边界和迁移见 [统一配置指南](CONFIG.md)，可运行例子见 [examples/configuration](examples/configuration/README.md)。回归、模糊测试与启动加载性能见 [验收记录](reports/configurationAcceptance.md)。47 个测试包的全量 race、Go 1.22 兼容、vet/build、30 秒 fuzz 与 5 个基准场景三轮测量通过。空缓存远程安装和 8 组生成消费者回归通过，无本地 replace；标签固定在 `c60841f901a3bcc3e9582eece6cfb2cad008fb9e`，见 [远程记录](reports/configurationRemote.json)。仍为 preview；项目的实际配置和业务依赖应自行验收。
+
+---
+
+# v0.19.0-preview（历史版本）

 将可选结构转换改为直接 Go 调用，减少业务项目需要维护的配置。普通接口继续使用 `.api` 生成 DTO，不要求增加独立模型或任何拷贝规则。

@@ -19,7 +139,7 @@ go test ./...

 迁移步骤和语义边界见 [copyx](COPY.md#从旧-mapping-迁移)。新工具做运行时检查，不能声称具备旧生成器的编译期字段覆盖保证；实际类型对必须有测试。独立三端工资示例验证金额精度、缺失/null/零值、空集合、错误链和字段新增；不修改或代替接入项目的完整业务回归。

-46 个测试包的全量 race（含实际生成项目）、vet/build、Go 1.22 兼容测试通过；30 秒 fuzz 无失败，14 种基准场景各测量三轮。验收条件、性能数据及本轮未覆盖的外部环境见 [v0.19 验收记录](reports/copyxAcceptance.md)。本版仍为 preview。
+46 个测试包的全量 race（含实际生成项目）、vet/build、Go 1.22 兼容测试通过；30 秒 fuzz 无失败，14 种基准场景各测量三轮。验收条件、性能数据及本轮未覆盖的外部环境见 [v0.19 验收记录](reports/copyxAcceptance.md)。本版仍为 preview。 空缓存远程 CLI 与 7 组真实生成消费者验收通过，无本地 replace；标签固定在 `fd83235ce7fc15ce88a482d385d70e61f25d7b32`，详见 [远程记录](reports/copyxRemote.json)。

 ---

@@ -92,7 +212,7 @@ go-omni api generate --check
 go test ./...
 ```

-旧项目 config/Logic/svc 继续由开发者维护，不会被重新生成覆盖。已有环境配置需按 [一次覆盖完整配置](DEVELOPMENT.md#一次覆盖完整配置与-http日志短名称) 合并 OverlayEnv 与 ApplyEnv；共享错误目录接入见 [workspace 配置](DEVELOPMENT.md#同一份-go-错误目录供多个服务生成)。已有手写权限 Handler 切换自动生成前，先迁出实现并显式移除 Manual 文件，生成器不会静默删除。
+旧项目 config/Logic/svc 继续由开发者维护，不会被重新生成覆盖。已有环境配置需按 本版当时的统一覆盖方式合并 OverlayEnv 与 ApplyEnv（该模式已在 v0.22 移除，当前升级见 [配置迁移](CONFIG.md#v022-迁移旧模式已移除)）；共享错误目录接入见 [workspace 配置](DEVELOPMENT.md#同一份-go-错误目录供多个服务生成)。已有手写权限 Handler 切换自动生成前，先迁出实现并显式移除 Manual 文件，生成器不会静默删除。

 全量 race（含实际生成消费者）、vet、build、根入口/退出/再生成验证通过。eTax 只读契约验收：API 文档 20,751,149 → 847,171 字节，ID 文档 1,008,210 → 392,481 字节；70 个操作展开引用后与原文档完全一致。空缓存远程 CLI / 固定版本消费者验收也已通过，没有本地 replace；标签固定在 `64e3bd6cfced225476d58e95037249cd0a4fe695`。详见 [验收记录](reports/contractFollowupAcceptance.md)。这不代表已完成业务项目迁移。

--- a/app/app.go
+++ b/app/app.go
@@ -12,6 +12,7 @@ import (
 	"time"

 	"git.yuntuo.hk/k2safe/go-omni/config"
+	"git.yuntuo.hk/k2safe/go-omni/cors"
 	apierrors "git.yuntuo.hk/k2safe/go-omni/errors"
 	"git.yuntuo.hk/k2safe/go-omni/httpx"
 	"git.yuntuo.hk/k2safe/go-omni/lifecycle"
@@ -24,6 +25,7 @@ import (
 // httpx.Router, leaving the network implementation replaceable.
 type App struct {
 	router           httpx.Router
+	handler          http.Handler
 	config           config.Config
 	middlewares      []httpx.Middleware
 	closers          []func() error
@@ -67,6 +69,11 @@ func configure(options ...config.Option) config.Config {
 }

 func newApp(router httpx.Router, settings config.Config) *App {
+	settings.CORS = settings.CORS.Clone()
+	corsPolicy, corsErr := cors.New(settings.CORS)
+	if corsErr != nil {
+		panic(config.AtField("cors", corsErr))
+	}
 	settings.Response = settings.Response.Clone()
 	settings.Errors = settings.Errors.Clone()
 	encoder, responseErr := response.New(settings.Response)
@@ -93,6 +100,7 @@ func newApp(router httpx.Router, settings config.Config) *App {
 	}
 	middlewares = append(middlewares, middleware.Recovery())
 	application := &App{router: router, config: settings, middlewares: middlewares, clientIPResolver: resolver, responseEncoder: responseEncoder}
+	application.handler = corsPolicy.Wrap(router)
 	if fallback, ok := router.(httpx.FallbackRouter); ok {
 		adaptError := func(status int, code, message string) http.Handler {
 			return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -104,21 +112,23 @@ func newApp(router httpx.Router, settings config.Config) *App {
 	return application
 }

-// Router returns the transport contract used by this application.
+// Router exposes the underlying routing contract for advanced registration.
+// Serve requests through App or Engine so application CORS policy is applied.
 func (a *App) Router() httpx.Router { return a.router }

 // Engine is kept as a compatibility name for the old API. It returns a
 // standard http.Handler, so callers do not depend on a router type.
-func (a *App) Engine() http.Handler { return a.router }
+func (a *App) Engine() http.Handler { return a.handler }

 // ServeHTTP implements http.Handler for standard servers and HTTP tests.
 func (a *App) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
-	a.router.ServeHTTP(writer, request)
+	a.handler.ServeHTTP(writer, request)
 }

 // Config returns the effective application configuration.
 func (a *App) Config() config.Config {
 	settings := a.config
+	settings.CORS = settings.CORS.Clone()
 	settings.Response = settings.Response.Clone()
 	settings.Errors = settings.Errors.Clone()
 	settings.TrustedProxies = append([]string(nil), settings.TrustedProxies...)
@@ -177,7 +187,7 @@ func (a *App) NewServer(address string) *http.Server {
 		}
 	}
 	cfg := a.config.HTTP
-	return &http.Server{Addr: address, Handler: a.router,
+	return &http.Server{Addr: address, Handler: a.handler,
 		ReadHeaderTimeout: cfg.ReadHeaderTimeout, ReadTimeout: cfg.ReadTimeout,
 		WriteTimeout: cfg.WriteTimeout, IdleTimeout: cfg.IdleTimeout,
 		MaxHeaderBytes: cfg.MaxHeaderBytes, ErrorLog: cfg.ErrorLog}
--- a/app/cors_test.go
+++ b/app/cors_test.go
@@ -0,0 +1,187 @@
+package app_test
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	omni "git.yuntuo.hk/k2safe/go-omni"
+	"git.yuntuo.hk/k2safe/go-omni/config"
+	"git.yuntuo.hk/k2safe/go-omni/httpx"
+	"git.yuntuo.hk/k2safe/go-omni/internal/testutil"
+	"git.yuntuo.hk/k2safe/go-omni/response"
+)
+
+func corsApp() *omni.App {
+	return omni.New(omni.WithCORS(omni.CORSConfig{Enabled: true, AllowedOrigins: []string{"https://web.example"}, AllowedMethods: []string{"GET", "POST", "PUT"}, AllowedHeaders: []string{"Authorization", "Content-Type"}, ExposedHeaders: []string{"Content-Disposition"}}), omni.WithResponse(response.Config{CodeType: "int32", SuccessCode: 0, ErrorCode: 999, MessageField: "msg", DataMode: "always"}))
+}
+func TestAppCORSRoutingAndErrors(t *testing.T) {
+	a := corsApp()
+	defer a.Close()
+	var middlewareCalls int
+	a.Use(func(next omni.Handler) omni.Handler {
+		return func(c *omni.Context) error { middlewareCalls++; return next(c) }
+	})
+	a.GET("/secure", func(c *omni.Context) error { return c.OK("private") }, func(next omni.Handler) omni.Handler {
+		return func(c *omni.Context) error { return omni.Unauthorized("LOGIN_REQUIRED", "login required") }
+	})
+	a.GET("/failure", func(c *omni.Context) error { return omni.Internal(errors.New("private detail")) })
+	a.GET("/panic", func(c *omni.Context) error { panic("private panic") })
+	a.Handle("OPTIONS", "/options", func(c *omni.Context) error { return c.Text(200, "ordinary options") })
+	for name, entry := range map[string]http.Handler{"App": a, "Engine": a.Engine(), "NewServer": a.NewServer("").Handler} {
+		t.Run(name, func(t *testing.T) {
+			for _, tc := range []struct {
+				method, path string
+				status       int
+			}{{"GET", "/secure", 401}, {"GET", "/failure", 500}, {"GET", "/panic", 500}, {"GET", "/absent", 404}, {"PUT", "/secure", 405}} {
+				r := httptest.NewRequest(tc.method, tc.path, nil)
+				r.Header.Set("Origin", "https://web.example")
+				w := httptest.NewRecorder()
+				entry.ServeHTTP(w, r)
+				var body map[string]any
+				err := json.Unmarshal(w.Body.Bytes(), &body)
+				if err != nil || w.Code != tc.status || w.Header().Get("Access-Control-Allow-Origin") != "https://web.example" || body["code"] != float64(999) || body["data"] != nil || body["msg"] == nil || strings.Contains(w.Body.String(), "private") {
+					t.Fatal(w.Code, w.Header(), w.Body.String(), err)
+				}
+			}
+			for _, path := range []string{"/secure", "/absent"} {
+				before := middlewareCalls
+				r := httptest.NewRequest("OPTIONS", path, nil)
+				r.Header.Set("Origin", "https://web.example")
+				r.Header.Set("Access-Control-Request-Method", "POST")
+				r.Header.Set("Access-Control-Request-Headers", "authorization,content-type")
+				w := httptest.NewRecorder()
+				entry.ServeHTTP(w, r)
+				if w.Code != 204 || w.Body.Len() != 0 || middlewareCalls != before {
+					t.Fatal(w.Code, w.Body.String(), middlewareCalls, before)
+				}
+			}
+			r := httptest.NewRequest("OPTIONS", "/options", nil)
+			w := httptest.NewRecorder()
+			entry.ServeHTTP(w, r)
+			if w.Code != 200 || w.Body.String() != "ordinary options" {
+				t.Fatal(w.Code, w.Body.String())
+			}
+		})
+	}
+}
+
+func TestAppCORSConfigIsolation(t *testing.T) {
+	cfg := config.Default()
+	cfg.CORS = omni.CORSConfig{Enabled: true, AllowedOrigins: []string{"https://one.example"}, AllowedHeaders: []string{"Authorization"}}
+	option := omni.WithConfig(cfg)
+	cfg.CORS.AllowedOrigins[0] = "https://evil.example"
+	a := omni.New(option)
+	defer a.Close()
+	b := omni.New(option)
+	defer b.Close()
+	a.Config().CORS.AllowedOrigins[0] = "https://evil.example"
+	for _, app := range []*omni.App{a, b} {
+		w := httptest.NewRecorder()
+		r := httptest.NewRequest("GET", "/absent", nil)
+		r.Header.Set("Origin", "https://one.example")
+		app.ServeHTTP(w, r)
+		if w.Header().Get("Access-Control-Allow-Origin") != "https://one.example" {
+			t.Fatal(w.Header())
+		}
+	}
+	defer func() {
+		if recover() == nil {
+			t.Error("invalid CORS passed direct New")
+		}
+	}()
+	omni.New(omni.WithCORS(omni.CORSConfig{Enabled: true}))
+}
+
+func TestCORSTransports(t *testing.T) {
+	for _, transport := range []string{omni.TransportNetHTTP, omni.TransportNative, omni.TransportHTTP2} {
+		t.Run(transport, func(t *testing.T) {
+			cert, key, tlsClient := testutil.CertificateFiles(t)
+			cfg := omni.CORSConfig{Enabled: true, AllowedOrigins: []string{"https://web.example"}, AllowedMethods: []string{"GET", "POST"}, AllowedHeaders: []string{"Content-Type"}, ExposedHeaders: []string{"Content-Disposition"}}
+			a := omni.New(omni.WithCORS(cfg), omni.WithTransport(transport), omni.WithTLS(cert, key))
+			var called atomic.Int32
+			a.Use(func(next omni.Handler) omni.Handler {
+				return func(c *omni.Context) error { called.Add(1); return next(c) }
+			})
+			a.POST("/upload", func(c *omni.Context) error {
+				b, err := io.ReadAll(c.Request().Body)
+				if err != nil {
+					return err
+				}
+				return c.Text(200, string(b))
+			})
+			a.GET("/download", func(c *omni.Context) error {
+				return c.WriteStream(200, "application/octet-stream", &httpx.Stream{Content: io.NopCloser(strings.NewReader("file bytes")), Name: "example.txt"})
+			})
+			listener, err := net.Listen("tcp", "127.0.0.1:0")
+			if err != nil {
+				t.Fatal(err)
+			}
+			ctx, cancel := context.WithCancel(context.Background())
+			done := make(chan error, 1)
+			go func() { done <- a.ServeContext(ctx, listener) }()
+			defer func() {
+				cancel()
+				select {
+				case err := <-done:
+					if err != nil {
+						t.Error(err)
+					}
+				case <-time.After(5 * time.Second):
+					t.Error("server did not close")
+					listener.Close()
+				}
+			}()
+			client := &http.Client{Timeout: 5 * time.Second, Transport: &http.Transport{TLSClientConfig: tlsClient, ForceAttemptHTTP2: true}}
+			defer client.CloseIdleConnections()
+			url := "https://" + listener.Addr().String()
+			for _, tc := range []struct {
+				method, path, body string
+				status             int
+			}{{"OPTIONS", "/upload", "", 204}, {"POST", "/upload", "raw upload", 200}, {"GET", "/download", "file bytes", 200}, {"GET", "/missing", "", 404}} {
+				var input io.Reader
+				if tc.method == "POST" {
+					input = strings.NewReader(tc.body)
+				}
+				r, _ := http.NewRequest(tc.method, url+tc.path, input)
+				r.Header.Set("Origin", "https://web.example")
+				if tc.method == "OPTIONS" {
+					r.Header.Set("Access-Control-Request-Method", "POST")
+					r.Header.Set("Access-Control-Request-Headers", "content-type")
+				}
+				res, err := client.Do(r)
+				if err != nil {
+					t.Fatal(err)
+				}
+				body, err := io.ReadAll(res.Body)
+				res.Body.Close()
+				if err != nil {
+					t.Fatal(err)
+				}
+				if res.StatusCode != tc.status || res.Header.Get("Access-Control-Allow-Origin") != "https://web.example" {
+					t.Fatal(res.StatusCode, res.Header)
+				}
+				if tc.status == 200 && string(body) != tc.body {
+					t.Fatal(string(body))
+				}
+				if tc.status == 204 && (len(body) != 0 || called.Load() != 0) {
+					t.Fatal("preflight reached middleware")
+				}
+				if tc.path == "/download" && (!strings.Contains(res.Header.Get("Content-Disposition"), "example.txt") || res.Header.Get("Access-Control-Expose-Headers") != "Content-Disposition") {
+					t.Fatal(res.Header)
+				}
+				if transport == omni.TransportHTTP2 && res.ProtoMajor != 2 {
+					t.Fatal(res.Proto)
+				}
+			}
+		})
+	}
+}
--- a/cmd/go-omni/README.md
+++ b/cmd/go-omni/README.md
@@ -14,7 +14,7 @@ v0.14 新增 `api format [--check]`、`api upgrade [--dry-run|--preview <空目

 ```sh
 # 仓库读取权限与 PATH 配置见根目录 README
-go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.19.0-preview
+go install git.yuntuo.hk/k2safe/go-omni/cmd/go-omni@v0.24.0-preview
 go-omni new --module example.com/hello ./hello

 # 从自己的契约生成；service.api 及其相对 import 文件需要在本地存在
@@ -49,14 +49,14 @@ main、Gen.go、OpenAPI 和 manifest 由生成器维护；业务文件按字节

 ## 版本与迁移

-CLI 与框架依赖固定使用 v0.19.0-preview。远程安装的 CLI 默认把自身版本写入 go.mod，不添加本地 replace；`--framework-version` 可显式指定已发布的兼容版本。仅在开发框架源码时使用本地替换：
+CLI 与框架依赖固定使用 v0.24.0-preview。远程安装的 CLI 默认把自身版本写入 go.mod，不添加本地 replace；`--framework-version` 可显式指定已发布的兼容版本。仅在开发框架源码时使用本地替换：

 ```sh
 # 在 go-omni 源码仓库中执行
 go run ./cmd/go-omni new --module example.com/hello --framework-dir . ../hello
 ```

-当前模板与依赖以 v0.19.0-preview 为基线，继续使用 manifest v2；GORM 可选适配器从 v0.14.1-preview 提供。已有项目使用 [定点升级与预览](../../DEVELOPMENT.md#v013-项目升级)：原始模板可自动替换，含业务修改的基础文件按预览合并；通用清理由 Runtime 负责。独立工具命令不会被删除。受管理项目通过 `.api` 模块导入增加业务，不使用旧 `add` 命令的手动路由装配。
+当前模板与依赖以 v0.24.0-preview 为基线，继续使用 manifest v2；GORM 可选适配器从 v0.14.1-preview 提供。已有项目使用 [定点升级与预览](../../DEVELOPMENT.md#v013-项目升级)：原始模板可自动替换，含业务修改的基础文件按预览合并；通用清理由 Runtime 负责。独立工具命令不会被删除。受管理项目通过 `.api` 模块导入增加业务，不使用旧 `add` 命令的手动路由装配。

 ## 数据库迁移命令

@@ -69,3 +69,9 @@ go-omni migrate --dir migrations --apply
 ```

 SQL 命名示例 `0001_createUsers.up.sql`；预览只显示版本和 SHA-256，不连接数据库。失败保留 dirty 状态，不自动 down/force。细节见 [扩展模块](../../ADVANCED.md)。
+
+### v0.22 文件显式配置
+
+新生成 `internal/config/loadGen.go` 调用统一加载，纳入生成检查；项目 config.go 只维护字段、默认值和校验，loader.go 用于注册额外格式。JSON/YAML/XML 内置。旧手写 Load 会阻止生成，请先按 [迁移步骤](../../CONFIG.md#v022-迁移旧模式已移除) 整理，不会自动覆盖业务代码。
+
+`go run . -config etc/config.test.yaml -check-config` 只做配置解析和校验，不初始化日志、数据库或监听。文件中的固定值不受环境自动覆盖；`${NAME}` 为必填引用，`${NAME:-fallback}` 提供备用值。
--- a/cmd/go-omni/apigen/configLoader_test.go
+++ b/cmd/go-omni/apigen/configLoader_test.go
@@ -0,0 +1,136 @@
+package apigen
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestGeneratedConfigurationConsumer(t *testing.T) {
+	if os.Getenv("GO_OMNI_SCAFFOLD_INTEGRATION") != "1" {
+		t.Skip("set GO_OMNI_SCAFFOLD_INTEGRATION=1")
+	}
+	dir := filepath.Join(t.TempDir(), "app")
+	api := filepath.Join(t.TempDir(), "service.api")
+	writeFile(t, api, "service configuration {\n@handler ping\nget /ping\n}\n")
+	o := Options{API: api, Dir: dir, Module: "example.com/configuration", FrameworkDir: frameworkRoot(t)}
+	if err := generateManagedTestProject(t, o); err != nil {
+		t.Fatal(err)
+	}
+	main := readFile(t, filepath.Join(dir, "main.go"))
+	// The business only changes fields/defaults/validation, not the loading flow.
+	writeFile(t, filepath.Join(dir, "internal/config/config.go"), `package config
+ import("git.yuntuo.hk/k2safe/go-omni/config";"git.yuntuo.hk/k2safe/go-omni/logx")
+ type Config struct { Server config.Config `+"`json:\"server\"`"+`;Limit int `+"`json:\"limit\"`"+` }
+ func Default()Config{ c:=config.Default();c.Log.File="./var/log/app.log";c.Log.Rotation=logx.RotationConfig{Enabled:true,MaxSizeMB:10};return Config{Server:c,Limit:10} }
+ func(c Config)Validate()error{if err:=c.Server.Validate();err!=nil{return config.AtField("server",err)};if c.Limit<0{return config.Invalid("limit","must not be negative")};return nil}
+ `)
+	writeFile(t, filepath.Join(dir, "internal/config/loader.go"), `package config
+ import omniConfig "git.yuntuo.hk/k2safe/go-omni/config"
+ func NewLoader()(*omniConfig.Loader,error){return omniConfig.NewLoader(omniConfig.WithDecoder("custom",omniConfig.JSONDecoder{}))}
+ `)
+	svc := filepath.Join(dir, "internal/svc/serviceContext.go")
+	writeFile(t, svc, strings.Replace(readFile(t, svc), "return nil", "panic(\"dependencies must not initialize on invalid config\")", 1))
+	writeFile(t, filepath.Join(dir, "consumer_test.go"), readFile(t, "testdata/configuration/consumer_test.go"))
+	runConsumerGo(t, dir, "mod", "tidy")
+	runConsumerGo(t, dir, "test", "-race", "-count=1", "./...")
+	runConsumerGo(t, dir, "build", ".")
+	o.API = filepath.Join(dir, "api/service.api")
+	before := snapshot(t, dir)
+	for _, mode := range []string{"dry", "generate", "check"} {
+		o.DryRun = mode == "dry"
+		o.Check = mode == "check"
+		if err := generateManagedTestProject(t, o); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if !sameFiles(before, snapshot(t, dir)) {
+		t.Fatal("business files overwritten")
+	}
+	if main != readFile(t, filepath.Join(dir, "main.go")) {
+		t.Fatal("main changed")
+	}
+	load := filepath.Join(dir, "internal/config/loadGen.go")
+	original := readFile(t, load)
+	writeFile(t, load, original+"\n// drift\n")
+	if err := generateManagedTestProject(t, o); err == nil {
+		t.Fatal("loadGen drift accepted")
+	}
+	writeFile(t, load, original)
+	if os.Getenv("GO_OMNI_RELEASE_CLI") != "" {
+		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+		defer cancel()
+		cmd := exec.CommandContext(ctx, "go", "list", "-m", "-json", frameworkModule)
+		cmd.Dir = dir
+		cmd.Env = append(os.Environ(), "GOWORK=off")
+		data, err := cmd.CombinedOutput()
+		if err != nil {
+			t.Fatal(err, string(data))
+		}
+		var dependency struct {
+			Version, Sum string
+			Replace      any
+		}
+		if err = json.Unmarshal(data, &dependency); err != nil {
+			t.Fatal(err)
+		}
+		if dependency.Version != os.Getenv("GO_OMNI_RELEASE_VERSION") || dependency.Replace != nil || dependency.Sum == "" {
+			t.Fatal("not a remote consumer")
+		}
+		t.Logf("remote framework %s checksum %s; no local replace", dependency.Version, dependency.Sum)
+	}
+}
+func TestConfigLoadMigrationGuard(t *testing.T) {
+	dir := filepath.Join(t.TempDir(), "app")
+	o := Options{Dir: dir, Module: "example.com/upgrade", FrameworkDir: frameworkRoot(t)}
+	if _, err := New(o); err != nil {
+		t.Fatal(err)
+	}
+	o.API = filepath.Join(dir, "api/service.api")
+	matches, err := filepath.Glob(filepath.Join(dir, "api/*.api"))
+	if err != nil || len(matches) != 1 {
+		t.Fatal(matches, err)
+	}
+	o.API = matches[0]
+	writeFile(t, filepath.Join(dir, "internal/config/legacy.go"), "package config\nfunc Load(path string)(Config,error){return Default(),nil}\n")
+	before := snapshot(t, dir)
+	for _, mode := range []string{"dry", "generate", "check"} {
+		o.DryRun = mode == "dry"
+		o.Check = mode == "check"
+		_, err := Generate(o)
+		if err == nil || !strings.Contains(err.Error(), "CONFIG.md") {
+			t.Fatal("missing migration diagnostic", err)
+		}
+		if !sameFiles(before, snapshot(t, dir)) {
+			t.Fatal("migration guard changed files")
+		}
+	}
+}
+
+func TestRemovedEnvironmentTagsRejectBeforeGeneration(t *testing.T) {
+	dir := filepath.Join(t.TempDir(), "app")
+	o := Options{Dir: dir, Module: "example.com/migrate", FrameworkDir: frameworkRoot(t)}
+	if _, err := New(o); err != nil {
+		t.Fatal(err)
+	}
+	o.API = filepath.Join(dir, "api/service.api")
+	path := filepath.Join(dir, "internal/config/config.go")
+	source := readFile(t, path)
+	writeFile(t, path, strings.Replace(source, "json:\"server\"", "json:\"server\" env:\"OLD_SERVER\"", 1))
+	before := snapshot(t, dir)
+	for _, mode := range []string{"dry", "generate", "check"} {
+		o.DryRun = mode == "dry"
+		o.Check = mode == "check"
+		if _, err := Generate(o); err == nil || !strings.Contains(err.Error(), "env/envDefault") {
+			t.Fatal(err)
+		}
+		if !sameFiles(before, snapshot(t, dir)) {
+			t.Fatal("migration rejection wrote files")
+		}
+	}
+}
--- a/cmd/go-omni/apigen/copyConsumer_test.go
+++ b/cmd/go-omni/apigen/copyConsumer_test.go
@@ -2,6 +2,7 @@ package apigen

 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"os"
 	"os/exec"
@@ -92,4 +93,26 @@ func(s *Logic)Save(ctx context.Context,req *types.%sRequest)(*types.EmployeeResp
 	}
 	runConsumerGo(t, dir, "test", "-race", "-count=1", "./...")
 	runConsumerGo(t, dir, "build", ".")
+	if os.Getenv("GO_OMNI_RELEASE_CLI") != "" {
+		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+		defer cancel()
+		cmd := exec.CommandContext(ctx, "go", "list", "-m", "-json", frameworkModule)
+		cmd.Dir = dir
+		cmd.Env = append(os.Environ(), "GOWORK=off")
+		data, err := cmd.CombinedOutput()
+		if err != nil {
+			t.Fatal(err, string(data))
+		}
+		var dependency struct {
+			Version, Sum string
+			Replace      any
+		}
+		if err = json.Unmarshal(data, &dependency); err != nil {
+			t.Fatal(err)
+		}
+		if dependency.Version != os.Getenv("GO_OMNI_RELEASE_VERSION") || dependency.Replace != nil || dependency.Sum == "" {
+			t.Fatal("not a fixed remote consumer")
+		}
+		t.Logf("remote framework %s checksum %s; no local replace", dependency.Version, dependency.Sum)
+	}
 }
--- a/cmd/go-omni/apigen/corsConsumer_test.go
+++ b/cmd/go-omni/apigen/corsConsumer_test.go
@@ -0,0 +1,59 @@
+package apigen
+
+import (
+	"encoding/json"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"testing"
+)
+
+func TestGeneratedCORSConsumer(t *testing.T) {
+	if os.Getenv("GO_OMNI_SCAFFOLD_INTEGRATION") != "1" {
+		t.Skip("set GO_OMNI_SCAFFOLD_INTEGRATION=1")
+	}
+	dir := filepath.Join(t.TempDir(), "app")
+	api := filepath.Join(t.TempDir(), "service.api")
+	writeFile(t, api, "service corsdemo {\n@handler ping\nget /ping\n}\n")
+	o := Options{API: api, Dir: dir, Module: "example.com/corsdemo", FrameworkDir: frameworkRoot(t)}
+	if err := generateManagedTestProject(t, o); err != nil {
+		t.Fatal(err)
+	}
+	writeFile(t, filepath.Join(dir, "consumer_test.go"), readFile(t, "testdata/cors/consumer_test.go"))
+	writeFile(t, filepath.Join(dir, "etc/config.yaml"), "server:\n  log:\n    output: discard\n  cors:\n    enabled: true\n    allowedOrigins: [https://web.example]\n    allowedMethods: [GET, POST, PUT]\n    allowedHeaders: [Authorization, Content-Type]\n    maxAge: 10m\n")
+	runConsumerGo(t, dir, "mod", "tidy")
+	runConsumerGo(t, dir, "test", "-race", "-count=1", "./...")
+	runConsumerGo(t, dir, "build", ".")
+	o.API = filepath.Join(dir, "api/service.api")
+	before := snapshot(t, dir)
+	for _, mode := range []string{"dry", "generate", "check"} {
+		o.DryRun = mode == "dry"
+		o.Check = mode == "check"
+		if err := generateManagedTestProject(t, o); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if !sameFiles(before, snapshot(t, dir)) {
+		t.Fatal("regeneration changed project files")
+	}
+	if os.Getenv("GO_OMNI_RELEASE_CLI") != "" {
+		cmd := exec.Command("go", "list", "-m", "-json", frameworkModule)
+		cmd.Dir = dir
+		cmd.Env = append(os.Environ(), "GOWORK=off")
+		out, err := cmd.CombinedOutput()
+		if err != nil {
+			t.Fatal(err, string(out))
+		}
+		var dependency struct {
+			Version, Sum string
+			Replace      any
+		}
+		if err := json.Unmarshal(out, &dependency); err != nil {
+			t.Fatal(err)
+		}
+		if dependency.Version != os.Getenv("GO_OMNI_RELEASE_VERSION") || dependency.Replace != nil || dependency.Sum == "" {
+			t.Fatal("not a fixed remote consumer")
+		}
+		t.Logf("remote framework %s checksum %s; no local replace", dependency.Version, dependency.Sum)
+	}
+}
--- a/cmd/go-omni/apigen/generate.go
+++ b/cmd/go-omni/apigen/generate.go
@@ -19,7 +19,10 @@ import (
 )

 const frameworkModule = "git.yuntuo.hk/k2safe/go-omni"
-const minimumVersion = "v0.19.0-preview"
+
+// Runtime-only releases need not raise the managed template compatibility floor.
+const minimumVersion = "v0.22.0-preview"
+const currentVersion = "v0.24.0-preview"
 const generatedHeader = "// Code generated by go-omni api. DO NOT EDIT.\n"

 type Options struct {
@@ -106,6 +109,9 @@ func generate(o Options, c *Compiled, starter bool) (Output, error) {
 	if err = checkRuntimeExtension(directory); err != nil {
 		return Output{}, err
 	}
+	if err = checkConfigLoadExtension(directory); err != nil {
+		return Output{}, err
+	}
 	for _, r := range c.Spec.Routes {
 		if !r.Manual {
 			path := filepath.Join(directory, "internal/handler", r.Group, lower(r.Handler)+"Manual.go")
@@ -152,7 +158,7 @@ func generate(o Options, c *Compiled, starter bool) (Output, error) {
 					if !filepath.IsAbs(path) {
 						path = filepath.Join(directory, path)
 					}
-					if source, err := os.ReadFile(filepath.Join(path, "config", "env.go")); err == nil && strings.Contains(string(source), "func ServerEnvAliases(") {
+					if source, err := os.ReadFile(filepath.Join(path, "config", "references.go")); err == nil && strings.Contains(string(source), "func WithLookupEnv(") {
 						localCurrent = true
 					}
 				}
@@ -262,7 +268,7 @@ func generate(o Options, c *Compiled, starter bool) (Output, error) {
 		return Output{}, errors.New("generation configuration changed during generation; retry")
 	}
 	out, err := apply(directory, o.Module, entry, generated, seeds, o.Check, o.DryRun, o.profile(), snapshotContract(c.Spec), o.lockHeld)
-	expectedVersion := minimumVersion
+	expectedVersion := currentVersion
 	if info, ok := debug.ReadBuildInfo(); ok && info.Main.Path == frameworkModule && info.Main.Sum != "" && semver.IsValid(info.Main.Version) {
 		expectedVersion = info.Main.Version
 	}
@@ -301,7 +307,7 @@ func moduleFile(o Options) ([]byte, error) {
 		if info, ok := debug.ReadBuildInfo(); ok && info.Main.Path == frameworkModule && info.Main.Sum != "" {
 			version = info.Main.Version
 		} else {
-			version = minimumVersion
+			version = currentVersion
 		}
 	}
 	if !semver.IsValid(version) || semver.Major(version) != "v0" && semver.Major(version) != "v1" {
--- a/cmd/go-omni/apigen/profile_test.go
+++ b/cmd/go-omni/apigen/profile_test.go
@@ -63,18 +63,23 @@ func TestAPIInfrastructureConsumers(t *testing.T) {
 					t.Fatal(err)
 				}
 				test := `package config
-import("testing";"os")
+import("testing";"os";"strings")
 func TestConfiguration(t *testing.T){
- t.Setenv("GO_OMNI_DB_DSN","test:test@tcp(127.0.0.1:1)/test")
+ t.Setenv("GO_OMNI_DB_DATABASE","test");t.Setenv("GO_OMNI_DB_USER","test");t.Setenv("GO_OMNI_DB_PASSWORD","test")
 t.Setenv("GO_OMNI_STORAGE_SIGNING_KEY","01234567890123456789012345678901")
 t.Setenv("GO_OMNI_STORAGE_ACCESS_KEY","test");t.Setenv("GO_OMNI_STORAGE_SECRET_KEY","test")
 t.Setenv("GO_OMNI_STORAGE_BUCKET","test");t.Setenv("GO_OMNI_STORAGE_ENDPOINT","ENDPOINT")
 t.Setenv("GO_OMNI_STORAGE_ACCOUNT_ID","01234567890123456789012345678901")
 cfg,err:=Load("../../etc/config.yaml");if err!=nil{t.Fatal(err)}
 if cfg.Server.Log.File==""{t.Fatal("file logger absent")}
- t.Setenv("GO_OMNI_LOG_OUTPUT","stdout");cfg,err=Load("");if err!=nil||cfg.Server.Log.File!=""{t.Fatalf("override: %v",err)}
- t.Setenv("GO_OMNI_SERVER_LOG_FILE","./explicit.log");cfg,err=Load("");if err!=nil||cfg.Server.Log.File!="./explicit.log"{t.Fatalf("canonical log file: %v",err)}
- t.Setenv("GO_OMNI_SERVER_LOG_OUTPUT","stderr");cfg,err=Load("");if err!=nil||cfg.Server.Log.Output!="stderr"{t.Fatalf("canonical output: %v",err)}
+ t.Setenv("GO_OMNI_LOG_OUTPUT","stdout");t.Setenv("GO_OMNI_SERVER_LOG_FILE","./implicit.log")
+ cfg,err=Load("../../etc/config.yaml");if err!=nil||cfg.Server.Log.File!=Default().Server.Log.File{t.Fatalf("implicit environment override: %v",err)}
+ raw,err:=os.ReadFile("../../etc/config.yaml");if err!=nil{t.Fatal(err)}
+ // Add explicit fields while keeping storage and DB requirements.
+ raw=[]byte(strings.Replace(string(raw),"server:\n","server:\n  log:\n    output: '${OUTPUT:-stdout}'\n    file: ''\n    rotation:\n      enabled: false\n",1))
+ path:="explicit.yaml";if err=os.WriteFile(path,raw,0600);err!=nil{t.Fatal(err)};defer os.Remove(path)
+ cfg,err=Load(path);if err!=nil||cfg.Server.Log.Output!="stdout"||cfg.Server.Log.File!=""||cfg.Server.Log.Rotation.Enabled{t.Fatalf("explicit file override: %v",err)}
+
 _=os.Getenv("unused")
 }`
 				endpoint := ""
--- a/cmd/go-omni/apigen/templates.go
+++ b/cmd/go-omni/apigen/templates.go
@@ -19,8 +19,10 @@ import (
 "MODULE/internal/svc"
 )
 func main(){
- path:=flag.String("config","etc/config.yaml","configuration file; empty uses defaults and environment")
+ path:=flag.String("config","etc/config.yaml","configuration file; empty uses only Default()")
+ check:=flag.Bool("check-config",false,"validate configuration and exit without starting dependencies")
 flag.Parse()
+ if *check {if _,err:=config.Load(*path);err!=nil{log.Fatal(err)};return}
 ctx,stop:=signal.NotifyContext(context.Background(),os.Interrupt,syscall.SIGTERM)
 defer stop()
 if err:=run(ctx,*path);err!=nil{log.Fatal(err)}
@@ -58,6 +60,13 @@ Unimplemented/nil factories fail startup and clean registered dependencies.
 Existing projects retain middleware: handlers until explicitly migrated.
 Ordinary Logic uses the generated Request/Response types directly. Where an
 independent business type is needed, use ordinary Go or the optional copyx package.
+Configuration loading is generator-managed in internal/config/loadGen.go. Extend fields/defaults/Validate in config.go; additional decoders belong in loader.go/NewLoader. JSON/YAML/XML use explicit ${NAME} / ${NAME:-fallback} references; fixed values are never overridden by inferred environment names. Use -check-config to validate without opening dependencies. Framework validation
+identifies fields such as server.log.level and database.port. server.log.timeZone
+optionally selects a per-logger IANA zone. Optional server.cors is loaded and installed
+automatically before routing/authentication; disabled by default. Configure allowedOrigins,
+allowedMethods and allowedHeaders in the selected file; no main/handler edits.
+See the framework CONFIG.md and cors/README.md.
+
 There are no mappings/mappingFiles settings or generated mapping files in v0.19.
 See COPY.md in the framework repository for copy policies and migration steps,
 and GENERATION.md for field composition and middleware factories.
@@ -75,7 +84,7 @@ Configure server.endpoints to disable or move each built-in route. Health
 responseMode is app by default (project format), or raw for plain health data.
 Probe HTTP statuses remain 200/503 even when business errors use HTTP 200.
 OpenAPI remains an unwrapped document; disabled endpoints reserve no paths.
-Set GO_OMNI_TRANSPORT=native to select the native transport without changing services.
+The default file explicitly references GO_OMNI_TRANSPORT; set it to native or edit server.transport.
 The greeting starter works immediately; other new operation stubs return 501 until
 their business logic is implemented. Authentication hooks also fail closed with 501.

@@ -137,7 +146,7 @@ Full reference: https://git.yuntuo.hk/k2safe/go-omni/src/branch/main/DEVELOPMENT
 api/                         # editable contract and imported types
 main.go                      # GENERATED startup, lifecycle and route registration
 etc/config.yaml              # lowerCamelCase configuration
-internal/config/             # defaults -> file -> environment
+internal/config/             # defaults -> file references -> typed binding -> validation
 internal/svc/                # dependency initialization and cleanup
 internal/types/*Gen.go        # DTOs split by source API, one types package
 internal/svc/runtimeGen.go    # GENERATED lifecycle and infrastructure startup
@@ -238,13 +247,16 @@ func infrastructureREADME(o Options) string {

 Selected database: %s; storage: %s; logging: %s/%s.
 MySQL uses database/sql through deps.DB, including InTx and a readiness probe.
-Use structured database/mysql configuration and GO_OMNI_DB_PASSWORD. Other connection/pool/TLS settings live in etc/config.yaml and GO_OMNI_DB_*.
+Use structured database/mysql configuration. The generated etc/config.yaml explicitly
+references GO_OMNI_DB_PASSWORD and other required connection values; add fixed
+values or explicit references for pool/TLS fields. No implicit environment overlay.
 No tables are invented or migrated automatically from request/response DTOs.
 The none/memory selection opens no database; implement repositories per business.

 With storage enabled, services receive deps.Files, Uploads, Downloads and
 UploadLinks capability interfaces. Local signed GET/HEAD/PUT uses /storage/object;
-set GO_OMNI_STORAGE_SIGNING_KEY (32+ bytes) and GO_OMNI_STORAGE_PUBLIC_URL.
+the generated file references GO_OMNI_STORAGE_SIGNING_KEY (32+ bytes) and
+GO_OMNI_STORAGE_PUBLIC_URL. File values may instead be fixed explicitly.
 Cloud credentials use GO_OMNI_STORAGE_ACCESS_KEY/SECRET_KEY; set bucket and endpoint
 or R2 accountId as appropriate. Signed URLs grant temporary access: authenticate
 and authorize before issuing them. No public upload-link route is added.
--- a/cmd/go-omni/apigen/testdata/configuration/consumer_test.go
+++ b/cmd/go-omni/apigen/testdata/configuration/consumer_test.go
@@ -0,0 +1,113 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"example.com/configuration/internal/config"
+	omniConfig "git.yuntuo.hk/k2safe/go-omni/config"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestGeneratedConfiguration(t *testing.T) {
+	for ext, source := range map[string]string{"json": `{"limit":"${LIMIT:-7}"}`, "yaml": "limit: '${LIMIT:-7}'\n", "xml": "<config><limit>${LIMIT:-7}</limit></config>", "custom": `{"limit":"${LIMIT:-7}"}`} {
+		t.Run(ext, func(t *testing.T) {
+			t.Setenv("LIMIT", "")
+			t.Setenv("GO_OMNI_LIMIT", "999")
+			path := filepath.Join(t.TempDir(), "app."+ext)
+			if err := os.WriteFile(path, []byte(source), 0600); err != nil {
+				t.Fatal(err)
+			}
+			cfg, err := config.Load(path)
+			if err != nil || cfg.Limit != 7 {
+				t.Fatal(cfg.Limit, err)
+			}
+			t.Setenv("LIMIT", "0")
+			cfg, err = config.Load(path)
+			if err != nil || cfg.Limit != 0 {
+				t.Fatal(cfg.Limit, err)
+			}
+		})
+	}
+	t.Setenv("GO_OMNI_LOG_OUTPUT", "stderr")
+	cfg, err := config.Load("")
+	if err != nil || cfg.Limit != 10 || cfg.Server.Log.File != "./var/log/app.log" || !cfg.Server.Log.Rotation.Enabled {
+		t.Fatal("implicit overlay", err)
+	}
+	path := filepath.Join(t.TempDir(), "bad.yaml")
+	os.WriteFile(path, []byte("limit: '${LIMIT}'\n"), 0600)
+	t.Setenv("LIMIT", "-1")
+	// svc.Init panics if reached. Both invalid startup and successful check must
+	// stop before opening the configured file logger or project dependencies.
+	err = run(context.Background(), path)
+	var d *omniConfig.Error
+	if !errors.As(err, &d) || d.Field != "limit" || d.File != path || d.Line != 1 || d.Env != "LIMIT" {
+		t.Fatal(err)
+	}
+	t.Setenv("LIMIT", "private-invalid")
+	_, err = config.Load(path)
+	if !errors.As(err, &d) || d.Env != "LIMIT" || strings.Contains(err.Error(), "private-invalid") {
+		t.Fatal(err)
+	}
+}
+func TestConfigurationCheckProcess(t *testing.T) {
+	exe := filepath.Join(t.TempDir(), "server")
+	cmd := exec.Command("go", "build", "-o", exe, ".")
+	if out, err := cmd.CombinedOutput(); err != nil {
+		t.Fatal(err, string(out))
+	}
+	dir := t.TempDir()
+	path := filepath.Join(dir, "selected.yaml")
+	if err := os.WriteFile(path, []byte("limit: '${LIMIT:-0}'\nserver:\n  address: 127.0.0.1:1\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	// A broken neighboring default/local/test file must never be layered in.
+	for _, name := range []string{"config.yaml", "config.local.yaml", "config.test.yaml"} {
+		os.WriteFile(filepath.Join(dir, name), []byte("broken: ["), 0600)
+	}
+	cmd = exec.Command(exe, "-config", path, "-check-config")
+	cmd.Dir = dir
+	if out, err := cmd.CombinedOutput(); err != nil || len(out) != 0 {
+		t.Fatal(err, string(out))
+	}
+	if _, err := os.Stat(filepath.Join(dir, "var")); !os.IsNotExist(err) {
+		t.Fatal("check opened logger/dependencies")
+	}
+	os.WriteFile(path, []byte("limit: '${MISSING_REQUIRED}'"), 0600)
+	cmd = exec.Command(exe, "-config", path, "-check-config")
+	cmd.Dir = dir
+	cmd.Env = append(os.Environ(), "MISSING_REQUIRED=")
+	out, err := cmd.CombinedOutput()
+	if err == nil || !strings.Contains(string(out), "MISSING_REQUIRED") || strings.Contains(string(out), "panic") {
+		t.Fatal(err, string(out))
+	}
+	cmd = exec.Command(exe, "-config", path)
+	cmd.Dir = dir
+	cmd.Env = append(os.Environ(), "MISSING_REQUIRED=")
+	if out, err := cmd.CombinedOutput(); err == nil || strings.Contains(string(out), "panic") {
+		t.Fatal(err, string(out))
+	}
+}
+
+func TestGeneratedModuleFieldDiagnostic(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "config.yaml")
+	t.Setenv("EXAMPLE_LOG_LEVEL", "invalid-private-level")
+	if err := os.WriteFile(path, []byte("server:\n  log:\n    level: '${EXAMPLE_LOG_LEVEL}'\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	err := run(context.Background(), path)
+	var d *omniConfig.Error
+	if !errors.As(err, &d) || d.Field != "server.log.level" || d.Line != 3 || d.Env != "EXAMPLE_LOG_LEVEL" || !strings.Contains(d.Reason, "debug") || strings.Contains(err.Error(), "invalid-private-level") {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(path, []byte("server:\n  log:\n    timeZone: Asia/Shanghai\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	cfg, err := config.Load(path)
+	if err != nil || cfg.Server.Log.TimeZone != "Asia/Shanghai" {
+		t.Fatal(err)
+	}
+}
--- a/cmd/go-omni/apigen/testdata/cors/consumer_test.go
+++ b/cmd/go-omni/apigen/testdata/cors/consumer_test.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"example.com/corsdemo/internal/config"
+	"example.com/corsdemo/internal/handler"
+	"example.com/corsdemo/internal/svc"
+	omniConfig "git.yuntuo.hk/k2safe/go-omni/config"
+	"git.yuntuo.hk/k2safe/go-omni/logx"
+)
+
+func TestGeneratedCORSConfiguration(t *testing.T) {
+	cfg, err := config.Load("etc/config.yaml")
+	if err != nil {
+		t.Fatal(err)
+	}
+	logger, err := logx.New(cfg.Server.Log)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer logger.Close()
+	deps, err := svc.New(context.Background(), logger, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer deps.Close()
+	a, err := handler.NewApp(deps)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer a.Close()
+	for _, tc := range []struct {
+		method, path string
+		status       int
+	}{{"GET", "/ping", 501}, {"GET", "/missing", 404}, {"PUT", "/ping", 405}, {"GET", "/health/live", 200}, {"GET", "/health/ready", 200}, {"GET", "/openapi.json", 200}, {"OPTIONS", "/ping", 204}} {
+		r := httptest.NewRequest(tc.method, tc.path, nil)
+		r.Header.Set("Origin", "https://web.example")
+		if tc.method == "OPTIONS" {
+			r.Header.Set("Access-Control-Request-Method", "GET")
+			r.Header.Set("Access-Control-Request-Headers", "authorization")
+		}
+		w := httptest.NewRecorder()
+		a.ServeHTTP(w, r)
+		if w.Code != tc.status || w.Header().Get("Access-Control-Allow-Origin") != "https://web.example" {
+			t.Fatal(tc, w.Code, w.Header(), w.Body.String())
+		}
+		if tc.status == 204 && (w.Body.Len() != 0 || w.Header().Get("Access-Control-Max-Age") != "600") {
+			t.Fatal(w)
+		}
+	}
+	// Startup config validation uses the normal generated run/Load, before log
+	// files or dependencies. No changes to generated main/HTTP composition.
+	path := filepath.Join(t.TempDir(), "invalid.yaml")
+	if err := os.WriteFile(path, []byte("server:\n  cors:\n    enabled: true\n    allowedOrigins: ['*']\n    allowCredentials: true\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	err = run(context.Background(), path)
+	var d *omniConfig.Error
+	if !errors.As(err, &d) || d.Field != "server.cors.allowedOrigins[0]" || !strings.Contains(d.Reason, "allowCredentials") {
+		t.Fatal(err)
+	}
+}
--- a/cmd/go-omni/apigen/testdata/managed/consumer_test.go
+++ b/cmd/go-omni/apigen/testdata/managed/consumer_test.go
@@ -123,7 +123,7 @@ func TestGeneratedTransfers(t *testing.T) {
 func configFile(t *testing.T, address string, fail bool) string {
 	t.Helper()
 	path := filepath.Join(t.TempDir(), "config.json")
-	data, _ := json.Marshal(map[string]any{"server": map[string]any{"address": address}, "failInit": fail})
+	data, _ := json.Marshal(map[string]any{"server": map[string]any{"address": address, "transport": "${GO_OMNI_TRANSPORT:-nethttp}"}, "failInit": fail})
 	if err := os.WriteFile(path, data, 0600); err != nil {
 		t.Fatal(err)
 	}
--- a/cmd/go-omni/apigen/testdata/managed/phases_test.go
+++ b/cmd/go-omni/apigen/testdata/managed/phases_test.go
@@ -24,7 +24,7 @@ func phasedConfig(t *testing.T, address, mode string, fail bool) string {
 	if mode == "stuck" {
 		drainTimeout = "50ms"
 	}
-	data, _ := json.Marshal(map[string]any{"backgroundMode": mode, "failInit": fail, "server": map[string]any{"address": address, "lifecycle": map[string]string{"stopTimeout": "1s", "drainTimeout": drainTimeout, "cancelTimeout": "50ms"}}})
+	data, _ := json.Marshal(map[string]any{"backgroundMode": mode, "failInit": fail, "server": map[string]any{"address": address, "transport": "${GO_OMNI_TRANSPORT:-nethttp}", "lifecycle": map[string]string{"stopTimeout": "1s", "drainTimeout": drainTimeout, "cancelTimeout": "50ms"}}})
 	if err := os.WriteFile(path, data, 0600); err != nil {
 		t.Fatal(err)
 	}
--- a/cmd/go-omni/apigen/upgrade.go
+++ b/cmd/go-omni/apigen/upgrade.go
@@ -14,7 +14,9 @@ import (
 	"golang.org/x/mod/semver"
 	"os"
 	"path/filepath"
+	"reflect"
 	"sort"
+	"strconv"
 	"strings"
 )

@@ -30,6 +32,55 @@ type UpgradePlan struct {
 	Module, Entry string
 }

+// Handwritten old loaders must be migrated explicitly, never silently replaced
+// or left competing with the generated entry point.
+func checkConfigLoadExtension(root string) error {
+	dir := filepath.Join(root, "internal/config")
+	entries, err := os.ReadDir(dir)
+	if errors.Is(err, os.ErrNotExist) {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+	for _, entry := range entries {
+		name := entry.Name()
+		if entry.IsDir() || !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") || name == "loadGen.go" {
+			continue
+		}
+		rel := "internal/config/" + name
+		if err := safePath(root, rel); err != nil {
+			return err
+		}
+		f, err := goparser.ParseFile(gotoken.NewFileSet(), filepath.Join(root, rel), nil, 0)
+		if err != nil {
+			return fmt.Errorf("parse %s: %w", rel, err)
+		}
+		var removed bool
+		ast.Inspect(f, func(n ast.Node) bool {
+			field, ok := n.(*ast.Field)
+			if ok && field.Tag != nil {
+				if raw, e := strconv.Unquote(field.Tag.Value); e == nil {
+					tag := reflect.StructTag(raw)
+					_, a := tag.Lookup("env")
+					_, b := tag.Lookup("envDefault")
+					removed = removed || a || b
+				}
+			}
+			return true
+		})
+		if removed {
+			return fmt.Errorf("%s: env/envDefault tags were removed; migrate defaults and explicit file references before generating; see CONFIG.md", rel)
+		}
+		for _, decl := range f.Decls {
+			if fn, ok := decl.(*ast.FuncDecl); ok && fn.Recv == nil && fn.Name.Name == "Load" {
+				return fmt.Errorf("%s: migrate the project-owned Load function before generating internal/config/loadGen.go; retain Config/Default/Validate and move decoder options to NewLoader; see CONFIG.md", rel)
+			}
+		}
+	}
+	return nil
+}
+
 // PlanUpgrade compares infrastructure against the exact previous release seeds.
 // A custom file is never classified as safe to replace. Logic, middleware,
 // options and repositories outside the changed templates are left untouched.
--- a/cmd/go-omni/apigen/upgrade_test.go
+++ b/cmd/go-omni/apigen/upgrade_test.go
@@ -39,7 +39,7 @@ func oldInfrastructureProject(t *testing.T) string {
 	raw, _ := json.Marshal(m)
 	writeFile(t, filepath.Join(dir, manifestPath), string(raw))
 	path := filepath.Join(dir, "go.mod")
-	writeFile(t, path, strings.ReplaceAll(readFile(t, path), minimumVersion, "v0.13.0-preview"))
+	writeFile(t, path, strings.ReplaceAll(readFile(t, path), currentVersion, "v0.13.0-preview"))
 	return dir
 }

@@ -74,7 +74,7 @@ func TestUpgradeV014PreservesExtensions(t *testing.T) {
 	raw, _ := json.Marshal(m)
 	writeFile(t, filepath.Join(dir, manifestPath), string(raw))
 	mod := filepath.Join(dir, "go.mod")
-	writeFile(t, mod, strings.ReplaceAll(readFile(t, mod), minimumVersion, "v0.14.1-preview"))
+	writeFile(t, mod, strings.ReplaceAll(readFile(t, mod), currentVersion, "v0.14.1-preview"))
 	owned := map[string]string{}
 	for _, name := range []string{"internal/svc/serviceContext.go", "internal/config/config.go", "etc/config.yaml"} {
 		path := filepath.Join(dir, name)
--- a/cmd/go-omni/apigen/write.go
+++ b/cmd/go-omni/apigen/write.go
@@ -284,6 +284,9 @@ func apply(root, module, entry string, generated, seeds map[string][]byte, check
 }
 func digest(data []byte) string { sum := sha256.Sum256(data); return hex.EncodeToString(sum[:]) }
 func ownedPath(name string) bool {
+	if name == "internal/config/loadGen.go" {
+		return true
+	}
 	if strings.HasPrefix(name, "internal/types/dto") && strings.HasSuffix(name, "Gen.go") && goName.MatchString(strings.TrimSuffix(filepath.Base(name), ".go")) {
 		return true
 	}
--- a/cmd/go-omni/main_test.go
+++ b/cmd/go-omni/main_test.go
@@ -8,7 +8,7 @@ import (
 )

 func TestNewWithRemoteFrameworkVersion(t *testing.T) {
-	for _, flag := range [][]string{{"--framework-version", "v0.19.0-preview"}, {"--framework-version=v0.19.0-preview"}} {
+	for _, flag := range [][]string{{"--framework-version", "v0.22.0-preview"}, {"--framework-version=v0.22.0-preview"}} {
 		project := filepath.Join(t.TempDir(), "billing")
 		args := append([]string{"--module", "example.com/billing"}, flag...)
 		if err := runNew(append(args, project)); err != nil {
@@ -18,7 +18,7 @@ func TestNewWithRemoteFrameworkVersion(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		if !strings.Contains(string(content), "go-omni v0.19.0-preview") || strings.Contains(string(content), "replace ") {
+		if !strings.Contains(string(content), "go-omni v0.22.0-preview") || strings.Contains(string(content), "replace ") {
 			t.Fatalf("CLI did not pin remote dependency: %s", content)
 		}
 	}
--- a/cmd/go-omni/scaffold/apiInfrastructure.go
+++ b/cmd/go-omni/scaffold/apiInfrastructure.go
@@ -21,6 +21,8 @@ func apiInfrastructure(module, database, storage, logOutput, logFormat string, l
 		"internal/svc/runtimeGen.go":     "templates/api-runtime.go.tmpl",
 		"internal/svc/options.go":        "templates/api-options.go.tmpl",
 		"internal/config/config.go":      "templates/api-config.go.tmpl",
+		"internal/config/loadGen.go":     "templates/api-load.go.tmpl",
+		"internal/config/loader.go":      "templates/api-loader.go.tmpl",
 		"etc/config.yaml":                "templates/modules-config.yaml.tmpl",
 		"internal/svc/serviceContext.go": "templates/api-context.go.tmpl",
 	}
@@ -31,6 +33,8 @@ func apiInfrastructure(module, database, storage, logOutput, logFormat string, l
 		files["internal/svc/storage.go"] = "templates/modules-storage.go.tmpl"
 	}
 	if legacy {
+		delete(files, "internal/config/loadGen.go")
+		delete(files, "internal/config/loader.go")
 		delete(files, "internal/svc/runtimeGen.go")
 		delete(files, "internal/svc/databaseOptions.go")
 		files["internal/svc/close.go"] = "templates/api-close.go.tmpl"
--- a/cmd/go-omni/scaffold/moduleProfiles_test.go
+++ b/cmd/go-omni/scaffold/moduleProfiles_test.go
@@ -66,9 +66,13 @@ func TestGenerateModuleProfiles(t *testing.T) {
 				t.Fatal("replacement does not resolve", err)
 			}
 			cfg, _ := os.ReadFile(filepath.Join(project, "etc/config.yaml"))
-			if strings.Contains(string(cfg), "secretKey:") || strings.Contains(string(cfg), "filesToken:") {
-				t.Fatal("secret defaults emitted")
+			for _, line := range strings.Split(string(cfg), "\n") {
+				key, value, ok := strings.Cut(strings.TrimSpace(line), ":")
+				if ok && (key == "secretKey" || key == "filesToken" || key == "signingKey") && !strings.Contains(value, "${GO_OMNI_") {
+					t.Fatal("secret must be an explicit reference")
+				}
 			}
+
 		})
 	}
 }
@@ -76,6 +80,7 @@ func TestModuleOptionsRejectBeforeWriting(t *testing.T) {
 	for _, options := range []Options{
 		{LogOutput: "invalid"}, {LogFormat: "xml"}, {Storage: "ftp"},
 		{Storage: "local", FrameworkVersion: "v0.6.0-preview"},
+		{FrameworkVersion: "v0.21.0-preview"},
 		{Module: "example.com/x\nrequire malicious v1.0.0"},
 	} {
 		options.Dir = filepath.Join(t.TempDir(), "project")
--- a/cmd/go-omni/scaffold/scaffold.go
+++ b/cmd/go-omni/scaffold/scaffold.go
@@ -34,9 +34,13 @@ type Options struct {
 }

 var files = map[string]string{
+	"internal/settings/config.go":      "templates/modules-settings.go.tmpl",
+	"internal/settings/config_test.go": "templates/modules-settings_test.go.tmpl",
+	"etc/config.yaml":                  "templates/modules-config.yaml.tmpl",
+
 	"go.mod":                             "templates/go.mod.tmpl",
 	"README.md":                          "templates/README.md.tmpl",
-	"cmd/server/main.go":                 "templates/cmd-server-main.go.tmpl",
+	"cmd/server/main.go":                 "templates/modules-main.go.tmpl",
 	"internal/model/user.go":             "templates/internal-model-user.go.tmpl",
 	"internal/model/errors.go":           "templates/internal-model-errors.go.tmpl",
 	"internal/repository/users.go":       "templates/internal-repository-users.go.tmpl",
@@ -109,7 +113,7 @@ func Generate(options Options) error {
 	if options.FrameworkDir != "" || options.FrameworkVersion == "" {
 		replace = frameworkReplace(directory, options.FrameworkDir)
 	}
-	if modules && replace == "" && semver.Compare(version, modulesFrameworkVersion) < 0 && version != installedFrameworkVersion() {
+	if replace == "" && semver.Compare(version, modulesFrameworkVersion) < 0 && version != installedFrameworkVersion() {
 		return fmt.Errorf("module templates require %s or newer; use --framework-dir for unpublished source", modulesFrameworkVersion)
 	}
 	data := templateData{
--- a/cmd/go-omni/scaffold/scaffold_test.go
+++ b/cmd/go-omni/scaffold/scaffold_test.go
@@ -39,7 +39,7 @@ func TestGenerateCreatesServiceLayout(t *testing.T) {
 	if err != nil {
 		t.Fatalf("read generated server: %v", err)
 	}
-	for _, expected := range []string{"config.LoadFromEnv(\"\")", "logx.SetDefault(logger)", "omni.WithConfig(settings)", "servicecontext.New(ctx, logger)", "services.Health.ReadinessHandler()", "application.RunContext(ctx, settings.Address)"} {
+	for _, expected := range []string{"settings.Load(path)", "logx.SetDefault(logger)", "omni.WithConfig(cfg.Server)", "servicecontext.New(ctx, logger, cfg)", "services.Health.ReadinessHandler()", "application.RunContext(ctx, cfg.Server.Address)"} {
 		if !strings.Contains(string(mainContent), expected) {
 			t.Fatalf("generated server missing %q: %s", expected, mainContent)
 		}
@@ -110,7 +110,7 @@ func TestFrameworkReplaceUsesCanonicalPaths(t *testing.T) {
 }

 func TestGenerateRemoteProjectPinsVersion(t *testing.T) {
-	for _, version := range []string{"v0.1.0", "v1.2.3-rc.1", "v0.0.0-20260920140624-8b19aa79eea0"} {
+	for _, version := range []string{"v0.22.0-preview", "v1.2.3-rc.1", "v0.22.1-0.20260926000000-8b19aa79eea0"} {
 		t.Run(version, func(t *testing.T) {
 			project := filepath.Join(t.TempDir(), "billing")
 			if err := Generate(Options{Dir: project, Module: "example.com/billing", FrameworkVersion: version}); err != nil {
--- a/cmd/go-omni/scaffold/templates/README.md.tmpl
+++ b/cmd/go-omni/scaffold/templates/README.md.tmpl
@@ -32,46 +32,44 @@ go mod tidy
 go run ./cmd/server
 ```

-运行时配置从 `GO_OMNI_*` 环境变量加载，例如：
+配置入口是 `internal/settings.Config`、`Default()`、`Validate()` 和 `etc/config.yaml`。
+只有文件里的 `${NAME}` / `${NAME:-fallback}` 会读取环境变量，固定值不受进程环境覆盖。生成的文件已声明地址、网络层，以及所选数据库/存储的必要引用；其他参数直接写进文件。

-```sh
-GO_OMNI_ENABLE_LOGGER=true GO_OMNI_LOG_LEVEL=debug go run ./cmd/server
+```yaml
+server:
+  address: "${GO_OMNI_HTTP_ADDR:-127.0.0.1:8080}"
+  transport: "${GO_OMNI_TRANSPORT:-nethttp}"
+  log:
+    level: debug
+  shutdownTimeout: 10s
 ```

-`GO_OMNI_HTTP_ADDR` 可以修改监听地址。生成项目默认提供 `/health/live` 和
-`/health/ready`，日志、请求 ID 和优雅退出等基础能力由 GoOmni 统一初始化；业务依赖集中放在项目自己的 `internal/servicecontext`。
-
-服务使用 `signal.NotifyContext` 处理 `SIGINT` / `SIGTERM`。部署时构建并运行服务二进制，
-使信号直接到达服务进程：
+用 `-config` 选择一个 YAML/JSON/XML 文件；`-config ''` 只使用 Default()；`-check-config` 仅加载和校验，不创建依赖或监听：

 ```sh
+go run ./cmd/server -config etc/config.yaml -check-config
 go build -o server ./cmd/server
-./server
+./server -config etc/config.yaml
 ```

-`GO_OMNI_SHUTDOWN_TIMEOUT` 控制等待请求完成的时间，默认 `10s`。
+服务通过 `signal.NotifyContext` 处理 `SIGINT` / `SIGTERM`，先排空 HTTP 请求，再关闭依赖和日志。生成项目默认提供 `/health/live` 和 `/health/ready`，业务依赖集中在 `internal/servicecontext`。

-使用支持统一网络配置的框架版本时，设置 `GO_OMNI_TRANSPORT=native` 即可切换为自研 HTTP/1.1；
-默认 `nethttp`。`GO_OMNI_TLS_CERT_FILE` 和 `GO_OMNI_TLS_KEY_FILE` 配对启用 HTTPS。
-实验版 HTTP/2 使用 `GO_OMNI_TRANSPORT=http2`，必须同时配置 TLS 证书和私钥。
-业务 Handler / Service / Repository 不需要修改；三种适配器共用上述退出等待时间。
+通过文件中的引用设置 `GO_OMNI_TRANSPORT=native` 可切换自研 HTTP/1.1，默认 nethttp。HTTPS 在文件的 `server.tls.certFile` / `server.tls.keyFile` 成对配置；实验 HTTP/2 选择 `http2` 且必须配置 TLS。不会自动读取未在文件声明的 TLS 环境变量。
 {{if eq .Database "mysql"}}
-`/health/ready` 已注册数据库探针：连接失败返回 `503`，数据库恢复后重新返回 `200`。
-`/health/live` 始终只检查服务存活。`GO_OMNI_DB_PING_TIMEOUT` 限制初始化检查和数据库探针的等待时间。
-退出时先排空 HTTP 请求，再关闭数据库连接池，最后关闭日志。
+`/health/ready` 已注册数据库探针，连接失败返回 503，恢复后返回 200；`/health/live` 只检查进程存活。连接池参数直接写入 `database`，缺失字段保留 Default()：

-数据库连接池参数：
-
-```text
-GO_OMNI_DB_MAX_OPEN_CONNS=10
-GO_OMNI_DB_MAX_IDLE_CONNS=5
-GO_OMNI_DB_CONN_MAX_LIFETIME=30m
-GO_OMNI_DB_CONN_MAX_IDLE_TIME=5m
-GO_OMNI_DB_PING_TIMEOUT=5s
+```yaml
+database:
+  driver: mysql
+  dsn: "${GO_OMNI_DB_DSN}"
+  maxOpenConns: 10
+  maxIdleConns: 5
+  connMaxLifetime: 30m
+  connMaxIdleTime: 5m
+  pingTimeout: 5s
 ```

-`MAX_IDLE_CONNS=0` 禁用空闲连接，`MAX_OPEN_CONNS=0` 表示不限制连接数。
-项目会启用 MySQL `parseTime` 并按 UTC 读取 DATETIME 字段，JSON 字段保持 lowerCamelCase。
+`maxIdleConns: 0` 禁用空闲连接；此项目要求 maxOpenConns 为正数。项目启用 MySQL parseTime，并按 UTC 读取 DATETIME；JSON 字段保持 lowerCamelCase。

 事务内复用 Repository（在业务代码中导入 `database/sql` 和项目的 `internal/repository`）：

--- a/cmd/go-omni/scaffold/templates/api-config.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/api-config.go.tmpl
@@ -1,10 +1,9 @@
 package settings
 import (
- "os"
 {{if and (not .API) (ne .Storage "none")}}"strings"{{end}}
 "time"
 "git.yuntuo.hk/k2safe/go-omni/config"
- "git.yuntuo.hk/k2safe/go-omni/logx"
+ {{if eq .LogOutput "file"}}"git.yuntuo.hk/k2safe/go-omni/logx"{{end}}
 {{if eq .Database "mysql"}}mysqladapter "git.yuntuo.hk/k2safe/go-omni/database/mysql"{{end}}
 {{if ne .Storage "none"}}"errors"
 {{if ne .Storage "r2"}}"net/url"{{else}}"regexp"{{end}}
@@ -12,8 +11,8 @@ import (
 )
 type Config struct {
 Server config.Config `json:"server"`
- {{if eq .Database "mysql"}}Database mysqladapter.Config `json:"database" env:"GO_OMNI_DB"`{{end}}
- {{if ne .Storage "none"}}Storage StorageConfig `json:"storage" env:"GO_OMNI_STORAGE"`{{end}}
+ {{if eq .Database "mysql"}}Database mysqladapter.Config `json:"database"`{{end}}
+ {{if ne .Storage "none"}}Storage StorageConfig `json:"storage"`{{end}}
 }
 func Default() Config {
 server:=config.Default()
@@ -35,22 +34,10 @@ func Default() Config {
 }{{end}}}
 }

-// Load applies defaults -> file -> typed environment -> validation.
-// New fields automatically use GO_OMNI_<JSON_PATH>, or an explicit env tag.
-func Load(path string)(Config,error){
- cfg:=Default();var err error
- cfg,err=config.ApplyDefaults(cfg);if err!=nil{return Config{},err}
- if path!="" {cfg,err=config.DecodeFile(path,cfg);if err!=nil{return Config{},err}}
- cfg,err=config.OverlayEnv(cfg,config.EnvOptions{Prefix:"GO_OMNI_",Empty:"ignore",Aliases:config.ServerEnvAliases("GO_OMNI_","server")});if err!=nil{return Config{},err}
- output,outputSet:=os.LookupEnv("GO_OMNI_SERVER_LOG_OUTPUT");if !outputSet {output=os.Getenv("GO_OMNI_LOG_OUTPUT")}
- file,fileSet:=os.LookupEnv("GO_OMNI_SERVER_LOG_FILE");if !fileSet {file=os.Getenv("GO_OMNI_LOG_FILE")}
- if output!="" && file=="" {cfg.Server.Log.File="";cfg.Server.Log.Rotation=logx.RotationConfig{}}
- return cfg,cfg.Validate()
-}
 func(c Config)Validate()error{
- if err:=c.Server.Validate();err!=nil{return err}
- {{if eq .Database "mysql"}}if err:=c.Database.Validate();err!=nil{return err}{{end}}
- {{if ne .Storage "none"}}if err:=c.Storage.Validate();err!=nil{return err}{{end}}
+ if err:=c.Server.Validate();err!=nil{return config.AtField("server",err)}
+ {{if eq .Database "mysql"}}if err:=c.Database.Validate();err!=nil{return config.AtField("database",err)}{{end}}
+ {{if ne .Storage "none"}}if err:=c.Storage.Validate();err!=nil{return config.AtField("storage",err)}{{end}}
 return nil
 }
 {{if ne .Storage "none"}}
@@ -67,12 +54,12 @@ type StorageConfig struct {
 ContentTypes []string `json:"contentTypes"`
 LinkTTL time.Duration `json:"linkTtl"`
 RequestTimeout time.Duration `json:"requestTimeout"`
- // Secrets are environment-only and cannot be populated by config files.
- FilesToken string `json:"-" env:"GO_OMNI_FILES_TOKEN,secret"`
- SigningKey string `json:"-" env:"GO_OMNI_STORAGE_SIGNING_KEY,secret"`
- AccessKey string `json:"-" env:"GO_OMNI_STORAGE_ACCESS_KEY,secret"`
- SecretKey string `json:"-" env:"GO_OMNI_STORAGE_SECRET_KEY,secret"`
- SessionToken string `json:"-" env:"GO_OMNI_STORAGE_SESSION_TOKEN,secret"`
+ // File values may explicitly reference environment variables. Never log this struct.
+ FilesToken string `json:"filesToken"`
+ SigningKey string `json:"signingKey"`
+ AccessKey string `json:"accessKey"`
+ SecretKey string `json:"secretKey"`
+ SessionToken string `json:"sessionToken"`
 }
 func (s StorageConfig) Policy()storage.UploadPolicy{return storage.UploadPolicy{MaxBytes:s.MaxBytes,ContentTypes:s.ContentTypes}}
 func (s StorageConfig) Validate()error {
@@ -80,14 +67,14 @@ func (s StorageConfig) Validate()error {
 if err:=s.Policy().Validate();err!=nil{return err}
 if s.LinkTTL<time.Second || s.LinkTTL>time.Hour{return errors.New("storage.linkTtl must be 1s..1h")}
 if s.RequestTimeout<=0 || s.RequestTimeout>5*time.Minute{return errors.New("storage.requestTimeout must be >0 and <=5m")}
- {{if not .API}}if len(s.FilesToken)<32 || strings.ContainsAny(s.FilesToken," \t\r\n") {return errors.New("set GO_OMNI_FILES_TOKEN to a token of at least 32 bytes without whitespace")}{{end}}
+ {{if not .API}}if len(s.FilesToken)<32 || strings.ContainsAny(s.FilesToken," \t\r\n") {return errors.New("storage.filesToken requires at least 32 bytes without whitespace")}{{end}}
 {{if eq .Storage "local"}}
 if s.Root=="" {return errors.New("storage.root is required")}
 u,err:=url.Parse(s.PublicURL)
 if err!=nil || u.Host=="" || u.Hostname()=="" || (u.Scheme!="http" && u.Scheme!="https") || u.User!=nil || u.RawQuery!="" || u.Fragment!="" || u.Path!="/storage/object" {return errors.New("storage.publicUrl must be an absolute HTTP(S) URL ending in /storage/object")}
- if len(s.SigningKey)<32 {return errors.New("set GO_OMNI_STORAGE_SIGNING_KEY to a stable secret of at least 32 bytes")}
+ if len(s.SigningKey)<32 {return errors.New("storage.signingKey requires a stable secret of at least 32 bytes")}
 {{else}}
- if s.Bucket=="" || s.Region=="" || s.AccessKey=="" || s.SecretKey=="" {return errors.New("storage bucket, region and GO_OMNI_STORAGE_ACCESS_KEY/SECRET_KEY are required")}
+ if s.Bucket=="" || s.Region=="" || s.AccessKey=="" || s.SecretKey=="" {return errors.New("storage bucket, region, accessKey and secretKey are required")}
 {{if eq .Storage "r2"}}
 if !regexp.MustCompile(`^[a-fA-F0-9]{32}$`).MatchString(s.AccountID) || s.Region!="auto" || !s.Secure {return errors.New("R2 requires a 32-hex accountId, region auto and secure=true")}
 if s.Endpoint!=""{return errors.New("this R2 profile derives endpoint from accountId; customize servicecontext for a jurisdiction-specific endpoint")}
--- a/cmd/go-omni/scaffold/templates/api-load.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/api-load.go.tmpl
@@ -0,0 +1,8 @@
+package config
+import omniConfig "git.yuntuo.hk/k2safe/go-omni/config"
+// Load resolves explicit file references, binds onto Default and validates.
+// Ordinary projects only edit Config, Default, Validate and the selected file.
+func Load(path string)(Config,error){
+ loader,err:=NewLoader();if err!=nil{return Config{},err}
+ return omniConfig.LoadProject(path,Default(),loader)
+}
--- a/cmd/go-omni/scaffold/templates/api-loader.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/api-loader.go.tmpl
@@ -0,0 +1,7 @@
+package config
+
+import omniConfig "git.yuntuo.hk/k2safe/go-omni/config"
+
+// NewLoader is project-owned. JSON/YAML/XML work without changes. Register
+// additional format decoders here only when the project needs them.
+func NewLoader() (*omniConfig.Loader,error) { return omniConfig.NewLoader() }
--- a/cmd/go-omni/scaffold/templates/cmd-server-main.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/cmd-server-main.go.tmpl
@@ -1,57 +0,0 @@
-package main
-
-import (
-	"context"
-	"log"
-	"os"
-	"os/signal"
-	"strings"
-	"syscall"
-
-	omni "git.yuntuo.hk/k2safe/go-omni"
-	"git.yuntuo.hk/k2safe/go-omni/config"
-	"git.yuntuo.hk/k2safe/go-omni/logx"
-	"{{.Module}}/internal/handler"
-	"{{.Module}}/internal/service"
-	"{{.Module}}/internal/servicecontext"
-)
-
-func main() {
-	if err := run(); err != nil {
-		log.Fatal(err)
-	}
-}
-
-func run() error {
-	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
-	defer stop()
-
-	settings, err := config.LoadFromEnv("")
-	if err != nil {
-		return err
-	}
-	if strings.TrimSpace(settings.Log.Service) == "" {
-		settings.Log.Service = "{{.Module}}"
-	}
-	logger, err := logx.New(settings.Log)
-	if err != nil {
-		return err
-	}
-	defer logger.Close()
-	// Access logs and business logs share the same configured sink.
-	logx.SetDefault(logger)
-
-	services, err := servicecontext.New(ctx, logger)
-	if err != nil { return err }
-	defer services.Close()
-	userService := service.NewUsers(services)
-	userHandler := handler.NewUsers(userService)
-
-	application := omni.New(omni.WithConfig(settings))
-	application.OnShutdown(logger.Close)
-	application.OnShutdown(services.Close)
-	application.GET("/health/live", services.Health.LivenessHandler())
-	application.GET("/health/ready", services.Health.ReadinessHandler())
-	userHandler.RegisterRoutes(application)
-	return application.RunContext(ctx, settings.Address)
-}
--- a/cmd/go-omni/scaffold/templates/databaseIntegration_test.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/databaseIntegration_test.go.tmpl
@@ -13,6 +13,7 @@ import (
 	"git.yuntuo.hk/k2safe/go-omni/database"
 	"git.yuntuo.hk/k2safe/go-omni/logx"
 	"{{.Module}}/internal/model"
+ "{{.Module}}/internal/settings"
 	"{{.Module}}/internal/repository"
 	"{{.Module}}/internal/servicecontext"
 )
@@ -23,15 +24,12 @@ func databaseContext(t *testing.T) *servicecontext.Context {
 	t.Helper()
 	dsn := os.Getenv("GO_OMNI_TEST_MYSQL_DSN")
 	if dsn == "" { t.Skip("set GO_OMNI_TEST_MYSQL_DSN to a dedicated test database") }
-	for _, key := range []string{"MAX_OPEN_CONNS", "MAX_IDLE_CONNS", "CONN_MAX_LIFETIME", "CONN_MAX_IDLE_TIME", "PING_TIMEOUT"} {
-		t.Setenv("GO_OMNI_DB_"+key, "")
-	}
 	t.Setenv("GO_OMNI_DB_DSN", dsn)
-	t.Setenv("GO_OMNI_DB_DRIVER", "mysql")
 	logger, err := logx.New(logx.Config{Writer: io.Discard})
 	if err != nil { t.Fatal(err) }
 	t.Cleanup(func() { _ = logger.Close() })
-	services, err := servicecontext.New(context.Background(), logger)
+	cfg,err:=settings.Load("../../etc/config.yaml");if err!=nil{t.Fatal(err)}
+ services, err := servicecontext.New(context.Background(), logger,cfg)
 	if err != nil { t.Fatal(err) }
 	t.Cleanup(func() { _ = services.Close() })
 	return services
--- a/cmd/go-omni/scaffold/templates/internal-servicecontext-context.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/internal-servicecontext-context.go.tmpl
@@ -2,6 +2,7 @@ package servicecontext

 import (
 	"context"
+ "{{.Module}}/internal/settings"
 {{if and .Modules (ne .Storage "none")}}"errors"
 "net/http"
 "sync"
@@ -38,16 +39,16 @@ type Context struct {

 // New initializes the project's dependencies before the HTTP listener opens.
 // The caller owns Logger; Close releases only resources created here.
-func New(ctx context.Context, logger *logx.Logger) (*Context, error) {
+func New(ctx context.Context, logger *logx.Logger, project settings.Config) (*Context, error) {
 	if ctx == nil { ctx = context.Background() }
 	if err := ctx.Err(); err != nil { return nil, err }
 	checker, err := health.New()
 	if err != nil { return nil, err }
 	services := &Context{Logger: logger, Health: checker}
 	{{if eq .Database "mysql"}}
-	cfg, err := database.ConfigFromEnv("")
-	if err != nil { return nil, err }
-	if cfg.Driver != "mysql" { return nil, fmt.Errorf("this project requires GO_OMNI_DB_DRIVER=mysql") }
+	cfg:=project.Database
+ if err:=cfg.Validate();err!=nil{return nil,err}
+	if cfg.Driver != "mysql" { return nil, fmt.Errorf("this project requires database.driver=mysql") }
 	dsn, err := mysql.ParseDSN(cfg.DSN)
 	if err != nil { return nil, fmt.Errorf("parse mysql connection settings: %w", err) }
 	if dsn.DBName == "" { return nil, fmt.Errorf("mysql connection settings require a database name") }
--- a/cmd/go-omni/scaffold/templates/modules-README.md.tmpl
+++ b/cmd/go-omni/scaffold/templates/modules-README.md.tmpl
@@ -2,7 +2,7 @@

 本项目选用日志输出 `{{.LogOutput}}`、格式 `{{.LogFormat}}`、对象存储 `{{.Storage}}`。数据库选择 `{{.Database}}` 独立于对象存储。

-配置入口为 `etc/config.yaml`，通过 `go run ./cmd/server -config /path/to/config.yaml` 指定其他 JSON/YAML 文件；`-config ''` 只用代码默认值和环境变量。优先级：默认值 → 文件 → 非空环境变量。未知字段、无效参数会在监听前拒绝。
+配置入口为 `etc/config.yaml`，通过 `go run ./cmd/server -config /path/to/config.yaml` 指定其他 JSON/YAML/XML 文件；`-config ''` 只用代码默认值。文件用 `${NAME}` 或 `${NAME:-fallback}` 显式引用变量，固定值不受隐式环境覆盖；`-check-config` 只检查、不初始化依赖。未知字段、无效参数会在监听前拒绝。

 ```sh
 go mod tidy
@@ -24,7 +24,7 @@ go run ./cmd/server

 {{if eq .Database "mysql"}}还需按 README 配置独立 MySQL 数据库并应用 schema.sql；应用不自动迁移。{{end}}

-默认仅监听 `127.0.0.1:8080`。`GO_OMNI_HTTP_ADDR` 覆盖地址；本地签名 URL 的外部地址通过 `GO_OMNI_STORAGE_PUBLIC_URL` 单独配置，始终以 `/storage/object` 结尾，不使用请求 Host 自动拼接可信链接。
+默认仅监听 `127.0.0.1:8080`。文件中的 `${GO_OMNI_HTTP_ADDR:-127.0.0.1:8080}` 设置地址；本地签名 URL 的外部地址通过 `GO_OMNI_STORAGE_PUBLIC_URL` 单独配置，始终以 `/storage/object` 结尾，不使用请求 Host 自动拼接可信链接。

 ## 日志

@@ -35,7 +35,7 @@ curl -H 'Content-Type: application/json' -H 'X-Request-ID: example-request' \
  -d '{"name":"Example","email":"example@example.com"}' http://127.0.0.1:8080/users
 ```

-`GO_OMNI_LOG_LEVEL`、`GO_OMNI_LOG_FORMAT`、`GO_OMNI_LOG_FILE` 覆盖对应项；显式设置 `GO_OMNI_LOG_OUTPUT=stdout` 且未设置 LOG_FILE 时，切换到控制台并关闭文件轮转。慢请求阈值为 500ms，可通过 `GO_OMNI_SLOW_REQUEST_THRESHOLD` 调整。字段脱敏不扫描 msg/error 中的自由文本；不要把凭据或签名 URL 拼到日志中。
+日志参数直接写在 `server.log`，例如 `level: debug`；也可显式写 `level: "${LOG_LEVEL:-info}"`。切换文件日志为控制台时，明确设置 `file: ""`、`output: stdout` 和 `rotation.enabled: false`，不会隐式重置其他字段。慢请求阈值使用 `server.slowRequestThreshold`，默认 500ms。字段脱敏不扫描 msg/error 自由文本；不要把凭据或签名 URL 拼到日志中。

 {{if ne .Storage "none"}}## 文件示例

@@ -66,18 +66,18 @@ curl -H "Authorization: Bearer $GO_OMNI_FILES_TOKEN" -H 'Content-Type: applicati

 响应包括随机 `data.key` 和 `data.request`（method/url/headers/expiresAt）。按返回的 method 和 headers 用原始文件字节上传到 URL；不能额外包 FormData。浏览器自动填写 Content-Length，其余签名 Header 原样发送；云桶需配置允许业务域名的 CORS。云端直传只绑定声明类型，实际内容需上传后验证；本地和 API 中转上传会检查允许类型及前缀嗅探结果。未完成内容验证前不要把暂存文件当作可信文件公开。

-| 参数 | 默认值 / 环境变量 |
+| 文件字段 | 默认值 / 含义 |
 | --- | --- |
-| 大小 | 32 MiB / GO_OMNI_STORAGE_MAX_BYTES |
-| 类型 | text/plain、image/png、image/jpeg、application/pdf / GO_OMNI_STORAGE_CONTENT_TYPES（逗号分隔） |
-| 链接有效期 | 5m / GO_OMNI_STORAGE_LINK_TTL（1s..1h） |
-| 请求超时 | 30s / GO_OMNI_STORAGE_REQUEST_TIMEOUT（>0 且 <=5m） |
-| 本地目录 | var/files / GO_OMNI_STORAGE_ROOT |
-| 本地外部 URL | http://127.0.0.1:8080/storage/object / GO_OMNI_STORAGE_PUBLIC_URL |
-| 云配置 | GO_OMNI_STORAGE_ENDPOINT、REGION、BUCKET、ACCOUNT_ID、SECURE |
-| 环境密钥 | GO_OMNI_FILES_TOKEN、GO_OMNI_STORAGE_SIGNING_KEY、GO_OMNI_STORAGE_ACCESS_KEY、SECRET_KEY、SESSION_TOKEN |
+| `storage.maxBytes` | 32 MiB |
+| `storage.contentTypes` | text/plain、image/png、image/jpeg、application/pdf；文件数组 |
+| `storage.linkTtl` | 5m，允许 1s..1h |
+| `storage.requestTimeout` | 30s，大于 0 且不超过 5m |
+| `storage.root` | var/files |
+| `storage.publicUrl` | http://127.0.0.1:8080/storage/object |
+| `storage.endpoint/region/bucket/accountId/secure` | 对应平台连接配置 |
+| `storage.filesToken/signingKey/accessKey/secretKey/sessionToken` | 文件显式引用环境变量提供凭据 |

-全部 JSON/YAML 字段使用 lowerCamelCase。密钥字段仅允许环境变量，配置文件中写入会报未知字段；不要把运行环境文件提交到仓库。S3 的 endpoint 为 host[:port]，OSS 的可选 endpoint 为 HTTPS origin；R2 从 accountId 派生官方 endpoint，region 为 auto。仅 S3/MinIO 的本地测试可设置 SECURE=false。
+全部 JSON/YAML/XML 字段使用 lowerCamelCase。文件可使用固定值或显式环境引用，不按字段名自动推导环境变量；凭据建议使用 `${NAME}`，不把含秘密的配置提交到仓库。S3 endpoint 为 host[:port]，OSS 可选 endpoint 为 HTTPS origin；R2 从 accountId 派生官方 endpoint，region 为 auto。仅 S3/MinIO 本地测试可设置 `storage.secure: false`。

 错误响应：未授权 401、无 Content-Length 411、超限 413、类型不允许 415、长度不符/非法 key 400、对象不存在 404、存储超时 504，其余内部错误统一隐藏细节。底层签名入口遵循存储协议返回 201/403 等状态，流式传输且访问日志保留实际状态。

--- a/cmd/go-omni/scaffold/templates/modules-config.yaml.tmpl
+++ b/cmd/go-omni/scaffold/templates/modules-config.yaml.tmpl
@@ -1,68 +1,30 @@
-# Non-secret settings only. Environment variables override these values.
+# Only fields listed here override Default(). Environment names are explicit.
 server:
-  address: '127.0.0.1:8080'
-  enableLogger: true
-  slowRequestThreshold: 500ms
-  shutdownTimeout: 10s
-{{if .API}}  lifecycle:
-    stopTimeout: 5s
-    drainTimeout: 10s
-    cancelTimeout: 5s
-  endpoints:
-    liveness:
-      enabled: true
-      path: /health/live
-      responseMode: app
-    readiness:
-      enabled: true
-      path: /health/ready
-      responseMode: app
-    openapi:
-      enabled: true
-      path: /openapi.json
-{{end}}
-  log:
-    service: {{printf "%q" .Module}}
-    level: info
-    format: {{.LogFormat}}
-{{if eq .LogOutput "file"}}    file: './var/log/server.log'
-    rotation:
-      enabled: true
-      maxSizeMb: 100
-      maxBackups: 10
-      maxAgeDays: 7
-      compress: true
-{{else}}    output: {{.LogOutput}}
-{{end}}    redactKeys: []
+  # Optional cross-origin access: server.cors (disabled by default). See framework cors/README.md.
+  address: "${GO_OMNI_HTTP_ADDR:-127.0.0.1:8080}"
+  transport: "${GO_OMNI_TRANSPORT:-nethttp}"
 {{if ne .Storage "none"}}storage:
-  provider: {{.Storage}}
-  maxBytes: 33554432
-  contentTypes: ['text/plain', 'image/png', 'image/jpeg', 'application/pdf']
-  linkTtl: 5m
-  requestTimeout: 30s
-{{if eq .Storage "local"}}  root: './var/files'
-  publicUrl: 'http://127.0.0.1:8080/storage/object'
-{{else}}  bucket: '' # set GO_OMNI_STORAGE_BUCKET
-  secure: true
-{{if eq .Storage "r2"}}  accountId: '' # set GO_OMNI_STORAGE_ACCOUNT_ID
-  region: auto
-{{else if eq .Storage "s3"}}  endpoint: '' # set GO_OMNI_STORAGE_ENDPOINT (host[:port])
-  region: us-east-1
-{{else}}  region: cn-hangzhou
-  endpoint: '' # empty uses the official regional endpoint
+{{if not .API}}  filesToken: "${GO_OMNI_FILES_TOKEN}"
+{{end}}{{if eq .Storage "local"}}  root: "${GO_OMNI_STORAGE_ROOT:-var/files}"
+  publicUrl: "${GO_OMNI_STORAGE_PUBLIC_URL:-http://127.0.0.1:8080/storage/object}"
+  signingKey: "${GO_OMNI_STORAGE_SIGNING_KEY}"
+{{else}}  bucket: "${GO_OMNI_STORAGE_BUCKET}"
+  accessKey: "${GO_OMNI_STORAGE_ACCESS_KEY}"
+  secretKey: "${GO_OMNI_STORAGE_SECRET_KEY}"
+  sessionToken: "${GO_OMNI_STORAGE_SESSION_TOKEN:-}"
+{{if eq .Storage "r2"}}  accountId: "${GO_OMNI_STORAGE_ACCOUNT_ID}"
+{{else if eq .Storage "s3"}}  endpoint: "${GO_OMNI_STORAGE_ENDPOINT}"
+  region: "${GO_OMNI_STORAGE_REGION:-us-east-1}"
+{{else}}  region: "${GO_OMNI_STORAGE_REGION:-cn-hangzhou}"
 {{end}}{{end}}{{end}}
-
 {{if and .API (eq .Database "mysql")}}database:
-  host: 127.0.0.1
-  port: 3306
-  database: '' # GO_OMNI_DB_DATABASE
-  user: '' # GO_OMNI_DB_USER; password via GO_OMNI_DB_PASSWORD
-  tls:
-    mode: required
-  pool:
-    maxOpenConns: 10
-    maxIdleConns: 5
-    connMaxLifetime: 30m
-    connMaxIdleTime: 5m
-    pingTimeout: 5s
+  host: "${GO_OMNI_DB_HOST:-127.0.0.1}"
+  port: "${GO_OMNI_DB_PORT:-3306}"
+  database: "${GO_OMNI_DB_DATABASE}"
+  user: "${GO_OMNI_DB_USER}"
+  password: "${GO_OMNI_DB_PASSWORD}"
+{{end}}
+{{if and (not .API) (eq .Database "mysql")}}database:
+  driver: mysql
+  dsn: "${GO_OMNI_DB_DSN}"
 {{end}}
--- a/cmd/go-omni/scaffold/templates/modules-main.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/modules-main.go.tmpl
@@ -18,8 +18,10 @@ import (
 )

 func main(){
- path:=flag.String("config","etc/config.yaml","JSON/YAML settings; empty uses defaults and environment")
+ path:=flag.String("config","etc/config.yaml","configuration file; empty uses only Default()")
+ check:=flag.Bool("check-config",false,"validate without starting dependencies")
 flag.Parse()
+ if *check {if _,err:=settings.Load(*path);err!=nil{log.Fatal(err)};return}
 if err:=run(*path);err!=nil{log.Fatal(err)}
 }
 func run(path string)(runErr error){
@@ -31,7 +33,7 @@ func run(path string)(runErr error){
 if err!=nil{return err}
 defer func(){runErr=errors.Join(runErr,logger.Close())}()
 logx.SetDefault(logger)
- services,err:=servicecontext.New(ctx,logger)
+ services,err:=servicecontext.New(ctx,logger,cfg)
 if err!=nil{return err}
 defer func(){runErr=errors.Join(runErr,services.Close())}()
 {{if ne .Storage "none"}}if err=services.InitStorage(ctx,cfg.Storage);err!=nil{return err}{{end}}
--- a/cmd/go-omni/scaffold/templates/modules-settings.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/modules-settings.go.tmpl
@@ -3,21 +3,19 @@ package settings

 import (
 "errors"
- "os"
 "strings"
 "time"
- {{if ne .Storage "none"}}"fmt"
+ {{if ne .Storage "none"}}
 {{if ne .Storage "r2"}}"net/url"{{else}}"regexp"{{end}}
- "strconv"
 "git.yuntuo.hk/k2safe/go-omni/storage"{{end}}
- {{if and .API (eq .Database "mysql")}}"git.yuntuo.hk/k2safe/go-omni/database"{{end}}
+ {{if eq .Database "mysql"}}"git.yuntuo.hk/k2safe/go-omni/database"{{end}}
 "git.yuntuo.hk/k2safe/go-omni/config"
- "git.yuntuo.hk/k2safe/go-omni/logx"
+ {{if eq .LogOutput "file"}}"git.yuntuo.hk/k2safe/go-omni/logx"{{end}}
 )

 type Config struct {
 Server config.Config `json:"server"`
- {{if and .API (eq .Database "mysql")}}Database database.Config `json:"database"`{{end}}
+ {{if eq .Database "mysql"}}Database database.Config `json:"database"`{{end}}
 {{if ne .Storage "none"}}Storage StorageConfig `json:"storage"`{{end}}
 }

@@ -31,7 +29,8 @@ func Default() Config {
 {{if eq .LogOutput "file"}}server.Log.File="./var/log/server.log"
 server.Log.Rotation=logx.RotationConfig{Enabled:true,MaxSizeMB:100,MaxBackups:10,MaxAgeDays:7,Compress:true}
 {{else}}server.Log.Output={{printf "%q" .LogOutput}}{{end}}
- return Config{Server:server{{if and .API (eq .Database "mysql")}},Database:database.DefaultConfig(){{end}}{{if ne .Storage "none"}},Storage:StorageConfig{
+ {{if eq .Database "mysql"}}db:=database.DefaultConfig();db.Driver="mysql"{{end}}
+ return Config{Server:server{{if eq .Database "mysql"}},Database:db{{end}}{{if ne .Storage "none"}},Storage:StorageConfig{
  Provider:{{printf "%q" .Storage}}, Root:"./var/files", PublicURL:"http://127.0.0.1:8080/storage/object",
  Secure:true, MaxBytes:32<<20, ContentTypes:[]string{"text/plain","image/png","image/jpeg","application/pdf"},
  LinkTTL:5*time.Minute, RequestTimeout:30*time.Second,
@@ -41,27 +40,10 @@ func Default() Config {
 }{{end}}}
 }

-// Load uses defaults -> strict YAML/JSON -> nonempty environment variables.
-// Pass an empty path to use only defaults and environment.
-func Load(path string)(Config,error) {
- cfg:=Default()
- var err error
- if path!="" { cfg,err=config.DecodeFile(path,cfg);if err!=nil{return Config{},err} }
- cfg.Server,err=config.ApplyEnv(cfg.Server,"")
- if err!=nil{return Config{},err}
- // A stream explicitly selected by environment overrides a file profile.
- if output:=strings.TrimSpace(os.Getenv("GO_OMNI_LOG_OUTPUT"));output!="" && strings.TrimSpace(os.Getenv("GO_OMNI_LOG_FILE"))=="" {
-  cfg.Server.Log.File="";cfg.Server.Log.Rotation=logx.RotationConfig{}
- }
- {{if ne .Storage "none"}}
- if err=cfg.Storage.applyEnv();err!=nil{return Config{},err}
- {{end}}
- {{if and .API (eq .Database "mysql")}}cfg.Database,err=database.ApplyEnv(cfg.Database,"");if err!=nil{return Config{},err}{{end}}
- if err=cfg.Validate();err!=nil{return Config{},err}
- return cfg,nil
-}
+// Load uses Default(), the selected file's explicit references, and Validate.
+func Load(path string)(Config,error){return config.LoadProject(path,Default())}
 func (c Config) Validate()error {
- {{if and .API (eq .Database "mysql")}}
+ {{if eq .Database "mysql"}}
 if err:=c.Database.Validate();err!=nil{return err}
 if c.Database.Driver!="mysql" || c.Database.MaxOpenConns<1 {return errors.New("database requires driver mysql and a positive maxOpenConns")}
 {{end}}
@@ -85,45 +67,27 @@ type StorageConfig struct {
 ContentTypes []string `json:"contentTypes"`
 LinkTTL time.Duration `json:"linkTtl"`
 RequestTimeout time.Duration `json:"requestTimeout"`
- // Secrets are environment-only and cannot be populated by config files.
- FilesToken string `json:"-"`
- SigningKey string `json:"-"`
- AccessKey string `json:"-"`
- SecretKey string `json:"-"`
- SessionToken string `json:"-"`
+ // Use explicit environment references in the configuration file for secrets.
+ FilesToken string `json:"filesToken"`
+ SigningKey string `json:"signingKey"`
+ AccessKey string `json:"accessKey"`
+ SecretKey string `json:"secretKey"`
+ SessionToken string `json:"sessionToken"`
 }
 func (s StorageConfig) Policy()storage.UploadPolicy{return storage.UploadPolicy{MaxBytes:s.MaxBytes,ContentTypes:s.ContentTypes}}
-func (s *StorageConfig) applyEnv()error {
- values:=map[string]*string{
-  "GO_OMNI_STORAGE_ROOT":&s.Root,"GO_OMNI_STORAGE_PUBLIC_URL":&s.PublicURL,
-  "GO_OMNI_STORAGE_ENDPOINT":&s.Endpoint,"GO_OMNI_STORAGE_REGION":&s.Region,
-  "GO_OMNI_STORAGE_BUCKET":&s.Bucket,"GO_OMNI_STORAGE_ACCOUNT_ID":&s.AccountID,
-  "GO_OMNI_STORAGE_SIGNING_KEY":&s.SigningKey,"GO_OMNI_FILES_TOKEN":&s.FilesToken,
-  "GO_OMNI_STORAGE_ACCESS_KEY":&s.AccessKey,"GO_OMNI_STORAGE_SECRET_KEY":&s.SecretKey,
-  "GO_OMNI_STORAGE_SESSION_TOKEN":&s.SessionToken,
- }
- for name,target:=range values {if value:=strings.TrimSpace(os.Getenv(name));value!=""{*target=value}}
- for name,target:=range map[string]*time.Duration{"GO_OMNI_STORAGE_LINK_TTL":&s.LinkTTL,"GO_OMNI_STORAGE_REQUEST_TIMEOUT":&s.RequestTimeout} {
-  if value:=strings.TrimSpace(os.Getenv(name));value!="" {v,err:=time.ParseDuration(value);if err!=nil{return fmt.Errorf("%s must be a duration",name)};*target=v}
- }
- if value:=os.Getenv("GO_OMNI_STORAGE_MAX_BYTES");value!=""{v,err:=strconv.ParseInt(value,10,64);if err!=nil{return errors.New("GO_OMNI_STORAGE_MAX_BYTES must be an integer")};s.MaxBytes=v}
- if value:=os.Getenv("GO_OMNI_STORAGE_SECURE");value!=""{v,err:=strconv.ParseBool(value);if err!=nil{return errors.New("GO_OMNI_STORAGE_SECURE must be a boolean")};s.Secure=v}
- if value:=strings.TrimSpace(os.Getenv("GO_OMNI_STORAGE_CONTENT_TYPES"));value!="" {s.ContentTypes=strings.Split(value,",");for i:=range s.ContentTypes{s.ContentTypes[i]=strings.TrimSpace(s.ContentTypes[i])}}
- return nil
-}
 func (s StorageConfig) Validate()error {
 if s.Provider!={{printf "%q" .Storage}} {return errors.New("storage.provider must match the adapter selected at generation")}
 if err:=s.Policy().Validate();err!=nil{return err}
 if s.LinkTTL<time.Second || s.LinkTTL>time.Hour{return errors.New("storage.linkTtl must be 1s..1h")}
 if s.RequestTimeout<=0 || s.RequestTimeout>5*time.Minute{return errors.New("storage.requestTimeout must be >0 and <=5m")}
- {{if not .API}}if len(s.FilesToken)<32 || strings.ContainsAny(s.FilesToken," \t\r\n") {return errors.New("set GO_OMNI_FILES_TOKEN to a token of at least 32 bytes without whitespace")}{{end}}
+ {{if not .API}}if len(s.FilesToken)<32 || strings.ContainsAny(s.FilesToken," \t\r\n") {return errors.New("storage.filesToken requires at least 32 bytes without whitespace")}{{end}}
 {{if eq .Storage "local"}}
 if s.Root=="" {return errors.New("storage.root is required")}
 u,err:=url.Parse(s.PublicURL)
 if err!=nil || u.Host=="" || u.Hostname()=="" || (u.Scheme!="http" && u.Scheme!="https") || u.User!=nil || u.RawQuery!="" || u.Fragment!="" || u.Path!="/storage/object" {return errors.New("storage.publicUrl must be an absolute HTTP(S) URL ending in /storage/object")}
- if len(s.SigningKey)<32 {return errors.New("set GO_OMNI_STORAGE_SIGNING_KEY to a stable secret of at least 32 bytes")}
+ if len(s.SigningKey)<32 {return errors.New("storage.signingKey requires a stable secret of at least 32 bytes")}
 {{else}}
- if s.Bucket=="" || s.Region=="" || s.AccessKey=="" || s.SecretKey=="" {return errors.New("storage bucket, region and GO_OMNI_STORAGE_ACCESS_KEY/SECRET_KEY are required")}
+ if s.Bucket=="" || s.Region=="" || s.AccessKey=="" || s.SecretKey=="" {return errors.New("storage bucket, region, accessKey and secretKey are required")}
 {{if eq .Storage "r2"}}
 if !regexp.MustCompile(`^[a-fA-F0-9]{32}$`).MatchString(s.AccountID) || s.Region!="auto" || !s.Secure {return errors.New("R2 requires a 32-hex accountId, region auto and secure=true")}
 if s.Endpoint!=""{return errors.New("this R2 profile derives endpoint from accountId; customize servicecontext for a jurisdiction-specific endpoint")}
--- a/cmd/go-omni/scaffold/templates/modules-settings_test.go.tmpl
+++ b/cmd/go-omni/scaffold/templates/modules-settings_test.go.tmpl
@@ -21,18 +21,18 @@ func environment(t *testing.T){
 }
 func TestSettingsPrecedenceAndStrictness(t *testing.T){
 environment(t)
+ {{if eq .Database "mysql"}}t.Setenv("GO_OMNI_DB_DSN","test:secret@tcp(localhost)/demo"){{end}}
+ source,err:=os.ReadFile("../../etc/config.yaml");if err!=nil{t.Fatal(err)}
 path:=filepath.Join(t.TempDir(),"config.yaml")
- if err:=os.WriteFile(path,[]byte("server:\n  address: '127.0.0.1:8123'\n  log:\n    level: debug\n"),0600);err!=nil{t.Fatal(err)}
+ source=[]byte(strings.Replace(string(source),"${GO_OMNI_HTTP_ADDR:-127.0.0.1:8080}","127.0.0.1:8123",1))
+ if err=os.WriteFile(path,source,0600);err!=nil{t.Fatal(err)}
 t.Setenv("GO_OMNI_HTTP_ADDR","127.0.0.1:9123")
 t.Setenv("GO_OMNI_LOG_OUTPUT","stdout")
 cfg,err:=Load(path);if err!=nil{t.Fatal(err)}
- if cfg.Server.Address!="127.0.0.1:9123" || cfg.Server.Log.Level!="debug" || cfg.Server.Log.Output!="stdout" || cfg.Server.Log.File!="" || cfg.Server.Log.Rotation.Enabled {t.Fatal("configuration precedence failed")}
- for _,body:=range []string{"unexpected: true","server:\n  slowRequestThreshold: -1s","server:\n  log:\n    format: invalid"{{if ne .Storage "none"}},"storage:\n  filesToken: forbidden","storage:\n  maxBytes: -1","storage:\n  provider: unsupported"{{end}}}{
-  if err:=os.WriteFile(path,[]byte(body),0600);err!=nil{t.Fatal(err)}
-  if _,err:=Load(path);err==nil{t.Fatal("invalid configuration accepted")}
+ initial:=Default()
+ if cfg.Server.Address!="127.0.0.1:8123"||cfg.Server.Log.Output!=initial.Server.Log.Output||cfg.Server.Log.File!=initial.Server.Log.File {t.Fatal("implicit overwrite")}
+ for _,body:=range []string{"unexpected: true","server:\n  slowRequestThreshold: -1s","server:\n  log:\n    format: invalid"}{
+  if err=os.WriteFile(path,[]byte(body),0600);err!=nil{t.Fatal(err)}
+  if _,err=Load(path);err==nil{t.Fatal("invalid configuration accepted")}
 }
- {{if ne .Storage "none"}}
- t.Setenv("GO_OMNI_FILES_TOKEN","")
- if _,err:=Load("");err==nil{t.Fatal("missing file token accepted")}
- {{end}}
 }
--- a/cmd/go-omni/scaffold/version.go
+++ b/cmd/go-omni/scaffold/version.go
@@ -10,11 +10,11 @@ const frameworkModule = "git.yuntuo.hk/k2safe/go-omni"
 // Source builds can carry an unpublished VCS version (including +dirty).
 // Keep this fallback in sync with the next release; installed CLIs use their
 // downloaded module version, which also has a module checksum.
-const defaultFrameworkVersion = "v0.19.0-preview"
+const defaultFrameworkVersion = "v0.24.0-preview"

 // This target is not a claim that the release already exists. Source users
 // select a local framework checkout until the module templates are published.
-const modulesFrameworkVersion = "v0.7.0-preview"
+const modulesFrameworkVersion = "v0.22.0-preview"

 func installedFrameworkVersion() string {
 	info, _ := debug.ReadBuildInfo()
--- a/config/aliases_test.go
+++ b/config/aliases_test.go
@@ -1,66 +0,0 @@
-package config
-
-import (
-	"strings"
-	"testing"
-	"time"
-)
-
-func TestUnifiedEnvAliases(t *testing.T) {
-	type project struct {
-		Server Config `json:"server"`
-		Label  string `json:"label"`
-	}
-	base := project{Server: Default(), Label: "base"}
-	for _, policy := range []string{"allow", "ignore", "reject"} {
-		t.Run(policy, func(t *testing.T) {
-			env := map[string]string{"TEST_HTTP_ADDR": "127.0.0.1:8099", "TEST_LOG_SERVICE": "", "TEST_SERVICE": "", "TEST_LABEL": ""}
-			opts := EnvOptions{Prefix: "TEST_", Empty: policy, Aliases: ServerEnvAliases("TEST_", "server"), Lookup: func(k string) (string, bool) { v, ok := env[k]; return v, ok }}
-			got, err := OverlayEnv(base, opts)
-			if policy == "reject" {
-				if err == nil || !strings.Contains(err.Error(), "empty") {
-					t.Fatal(err)
-				}
-				return
-			}
-			if err != nil {
-				t.Fatal(err)
-			}
-			if got.Server.Address != "127.0.0.1:8099" {
-				t.Fatal("alias ignored")
-			}
-			if policy == "allow" && got.Label != "" || policy == "ignore" && got.Label != "base" {
-				t.Fatal("empty policy differs")
-			}
-			env["TEST_SERVER_ADDRESS"] = "127.0.0.1:9001"
-			env["TEST_HTTP_READ_TIMEOUT"] = "3s"
-			env["TEST_ENABLE_LOGGER"] = "false"
-			env["TEST_TRUSTED_PROXIES"] = `["127.0.0.1"]`
-			got, err = OverlayEnv(base, opts)
-			if err != nil || got.Server.Address != "127.0.0.1:9001" || got.Server.HTTP.ReadTimeout != 3*time.Second || got.Server.EnableLogger || len(got.Server.TrustedProxies) != 1 {
-				t.Fatal(got, err)
-			}
-			env["TEST_SERVER_ADDRESS"] = ""
-			got, err = OverlayEnv(base, opts)
-			if err != nil {
-				t.Fatal(err)
-			}
-			expected := ""
-			if policy == "ignore" {
-				expected = base.Server.Address
-			}
-			if got.Server.Address != expected {
-				t.Fatal("empty canonical unexpectedly fell through to alias")
-			}
-		})
-	}
-	if base.Server.Address != ":8080" || base.Label != "base" {
-		t.Fatal("defaults mutated")
-	}
-}
-func TestAliasTypeErrorsDoNotExposeValue(t *testing.T) {
-	opts := EnvOptions{Prefix: "X_", Empty: "reject", Aliases: ServerEnvAliases("X_", ""), Lookup: func(k string) (string, bool) { return "private-invalid", k == "X_HTTP_READ_TIMEOUT" }}
-	if _, err := OverlayEnv(Default(), opts); err == nil || strings.Contains(err.Error(), "private-invalid") {
-		t.Fatal(err)
-	}
-}
--- a/config/bind.go
+++ b/config/bind.go
@@ -0,0 +1,336 @@
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"reflect"
+	"sort"
+	"strings"
+)
+
+var jsonUnmarshalerType = reflect.TypeOf((*json.Unmarshaler)(nil)).Elem()
+
+type documentBinder struct {
+	doc   Document
+	nodes int
+}
+
+func (b *documentBinder) step(path string, depth int) error {
+	b.nodes++
+	if depth > maxConfigDepth || b.nodes > maxConfigNodes {
+		return b.doc.diagnostic(path, "configuration nesting or node limit exceeded", nil)
+	}
+	return nil
+}
+
+func bindDocument[T any](doc Document, defaults T) (T, error) {
+	var zero T
+	base := reflect.ValueOf(&defaults).Elem()
+	if base.Kind() != reflect.Struct && (base.Kind() != reflect.Pointer || base.Type().Elem().Kind() != reflect.Struct) {
+		return zero, &Error{Reason: "project configuration must be a struct"}
+	}
+	result, err := cloneConfiguration(base, 0)
+	if err != nil {
+		return zero, &Error{Reason: "cannot clone configuration defaults", cause: err}
+	}
+	b := documentBinder{doc: doc}
+	if err = b.bind(doc.Value, result, "", 0, false); err != nil {
+		return zero, err
+	}
+	return result.Interface().(T), nil
+}
+
+func (b *documentBinder) decode(v any, dst reflect.Value, path string) (err error) {
+	defer func() {
+		if recover() != nil {
+			err = b.doc.diagnostic(path, "custom value decoder panicked", nil)
+		}
+	}()
+	raw, err := json.Marshal(v)
+	if err != nil {
+		return b.doc.diagnostic(path, "unsupported configuration value", err)
+	}
+	if err = json.Unmarshal(raw, dst.Addr().Interface()); err != nil {
+		return b.doc.diagnostic(path, "expected a valid "+dst.Type().String(), err)
+	}
+	return nil
+}
+func (b *documentBinder) bind(v any, dst reflect.Value, path string, depth int, quoted bool) error {
+	if err := b.step(path, depth); err != nil {
+		return err
+	}
+	if text, ok := v.(resolvedText); ok {
+		if dst.Kind() != reflect.Pointer && dst.Type() != durationType && dst.CanAddr() && !dst.Addr().Type().Implements(jsonUnmarshalerType) && !dst.Addr().Type().Implements(textType) {
+			switch dst.Kind() {
+			case reflect.Bool, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64:
+				if err := parseTextValue(dst, string(text)); err != nil {
+					return b.doc.diagnostic(path, "expected a valid "+dst.Type().String(), err)
+				}
+				return nil
+			}
+		}
+		if dst.Kind() != reflect.Pointer {
+			v = string(text)
+		}
+	}
+	if v == nil {
+		return b.decode(nil, dst, path)
+	} // Preserve encoding/json null semantics.
+	if dst.Kind() == reflect.Pointer {
+		if dst.IsNil() {
+			dst.Set(reflect.New(dst.Type().Elem()))
+		}
+		return b.bind(v, dst.Elem(), path, depth+1, quoted)
+	}
+	if dst.Type() == durationType {
+		var raw string
+		switch x := v.(type) {
+		case string:
+			raw = x
+		case Text:
+			raw = string(x)
+		default:
+			return b.decode(v, dst, path)
+		}
+		if err := parseTextValue(dst, strings.TrimSpace(raw)); err != nil {
+			return b.doc.diagnostic(path, "expected a duration such as 5s", err)
+		}
+		return nil
+	}
+	if dst.CanAddr() && dst.Addr().Type().Implements(jsonUnmarshalerType) {
+		normalized, err := b.dynamic(v, path, depth+1)
+		if err != nil {
+			return err
+		}
+		return b.decode(normalized, dst, path)
+	}
+	if dst.CanAddr() && dst.Addr().Type().Implements(textType) {
+		if text, ok := v.(Text); ok {
+			v = string(text)
+		}
+		return b.decode(v, dst, path)
+	}
+	if text, ok := v.(Text); ok {
+		if dst.Kind() == reflect.String || dst.Kind() == reflect.Interface || (dst.Kind() == reflect.Slice && dst.Type().Elem().Kind() == reflect.Uint8) {
+			return b.decode(string(text), dst, path)
+		}
+		switch dst.Kind() {
+		case reflect.Bool, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64:
+			if err := parseTextValue(dst, strings.TrimSpace(string(text))); err != nil {
+				return b.doc.diagnostic(path, "expected a valid "+dst.Type().String(), err)
+			}
+			return nil
+		default:
+			return b.doc.diagnostic(path, "expected an object or array, not scalar text", nil)
+		}
+	}
+	if quoted {
+		s, ok := v.(string)
+		if !ok {
+			return b.doc.diagnostic(path, "expected a JSON-encoded string", nil)
+		}
+		if err := json.Unmarshal([]byte(s), dst.Addr().Interface()); err != nil {
+			return b.doc.diagnostic(path, "invalid string-encoded value", err)
+		}
+		return nil
+	}
+	switch dst.Kind() {
+	case reflect.Struct:
+		m, ok := v.(map[string]any)
+		if !ok {
+			return b.doc.diagnostic(path, "expected an object", nil)
+		}
+		fields := configurationFields(dst.Type())
+		used := map[string]bool{}
+		for _, name := range sortedKeys(m) {
+			child := joinField(path, name)
+			f, ok := fields[name]
+			canonical := name
+			if !ok {
+				for n, field := range fields {
+					if strings.EqualFold(n, name) {
+						if ok {
+							return b.doc.diagnostic(child, "ambiguous field name", nil)
+						}
+						f, ok, canonical = field, true, n
+					}
+				}
+			}
+			if !ok {
+				return b.doc.diagnostic(child, unknownFieldReason(name, fields), nil)
+			}
+			if used[canonical] {
+				return b.doc.diagnostic(child, "duplicate field binding", nil)
+			}
+			used[canonical] = true
+			target := dst
+			for _, index := range f.Index {
+				if target.Kind() == reflect.Pointer {
+					if target.IsNil() {
+						if !target.CanSet() {
+							return b.doc.diagnostic(child, "field cannot be assigned", nil)
+						}
+						target.Set(reflect.New(target.Type().Elem()))
+					}
+					target = target.Elem()
+				}
+				target = target.Field(index)
+			}
+			if !target.CanSet() {
+				return b.doc.diagnostic(child, "field cannot be assigned", nil)
+			}
+			if err := b.bind(m[name], target, child, depth+1, strings.Contains(","+f.Tag.Get("json")+",", ",string,")); err != nil {
+				return err
+			}
+		}
+		return nil
+	case reflect.Map:
+		m, ok := v.(map[string]any)
+		if !ok || dst.Type().Key().Kind() != reflect.String {
+			return b.doc.diagnostic(path, "expected an object with string keys", nil)
+		}
+		if dst.IsNil() {
+			dst.Set(reflect.MakeMap(dst.Type()))
+		}
+		for _, key := range sortedKeys(m) {
+			value := reflect.New(dst.Type().Elem()).Elem()
+			if err := b.bind(m[key], value, joinField(path, key), depth+1, false); err != nil {
+				return err
+			}
+			k := reflect.New(dst.Type().Key()).Elem()
+			k.SetString(key)
+			dst.SetMapIndex(k, value)
+		}
+		return nil
+	case reflect.Slice, reflect.Array:
+		if _, ok := v.(string); ok && dst.Kind() == reflect.Slice && dst.Type().Elem().Kind() == reflect.Uint8 {
+			return b.decode(v, dst, path)
+		}
+		items, ok := v.([]any)
+		if !ok {
+			return b.doc.diagnostic(path, "expected an array", nil)
+		}
+		if dst.Kind() == reflect.Array && len(items) != dst.Len() {
+			return b.doc.diagnostic(path, "array length does not match its declared type", nil)
+		}
+		if dst.Kind() == reflect.Slice {
+			dst.Set(reflect.MakeSlice(dst.Type(), len(items), len(items)))
+		}
+		for i, value := range items {
+			if err := b.bind(value, dst.Index(i), fmt.Sprintf("%s[%d]", path, i), depth+1, false); err != nil {
+				return err
+			}
+		}
+		return nil
+	case reflect.Interface:
+		v, err := b.dynamic(v, path, depth+1)
+		if err != nil {
+			return err
+		}
+		if dst.Type().NumMethod() == 0 {
+			dst.Set(reflect.ValueOf(v))
+			return nil
+		}
+		return b.decode(v, dst, path)
+	default:
+		return b.decode(v, dst, path)
+	}
+}
+func sortedKeys(m map[string]any) []string {
+	keys := make([]string, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	return keys
+}
+func (b *documentBinder) dynamic(v any, path string, depth int) (any, error) {
+	if err := b.step(path, depth); err != nil {
+		return nil, err
+	}
+	switch x := v.(type) {
+	case Text:
+		return string(x), nil
+	case resolvedText:
+		return string(x), nil
+	case map[string]any:
+		out := make(map[string]any, len(x))
+		for _, k := range sortedKeys(x) {
+			c, err := b.dynamic(x[k], joinField(path, k), depth+1)
+			if err != nil {
+				return nil, err
+			}
+			out[k] = c
+		}
+		return out, nil
+	case []any:
+		out := make([]any, len(x))
+		for i, v := range x {
+			c, err := b.dynamic(v, fmt.Sprintf("%s[%d]", path, i), depth+1)
+			if err != nil {
+				return nil, err
+			}
+			out[i] = c
+		}
+		return out, nil
+	default:
+		return v, nil
+	}
+}
+
+// Match encoding/json's field promotion: the shallowest declaration wins;
+// explicit tags win ties, and ambiguous fields remain unavailable.
+func configurationFields(t reflect.Type) map[string]reflect.StructField {
+	type candidate struct {
+		field  reflect.StructField
+		tagged bool
+	}
+	candidates := map[string][]candidate{}
+	var visit func(reflect.Type, []int, map[reflect.Type]bool)
+	visit = func(current reflect.Type, prefix []int, visiting map[reflect.Type]bool) {
+		if visiting[current] {
+			return
+		}
+		visiting[current] = true
+		defer delete(visiting, current)
+		for i := 0; i < current.NumField(); i++ {
+			f := current.Field(i)
+			name := strings.Split(f.Tag.Get("json"), ",")[0]
+			if name == "-" {
+				continue
+			}
+			child := f.Type
+			if child.Kind() == reflect.Pointer {
+				child = child.Elem()
+			}
+			if f.PkgPath != "" && (!f.Anonymous || child.Kind() != reflect.Struct) {
+				continue
+			}
+			f.Index = append(append([]int(nil), prefix...), i)
+			if name == "" && f.Anonymous && child.Kind() == reflect.Struct {
+				visit(child, f.Index, visiting)
+				continue
+			}
+			tagged := name != ""
+			if name == "" {
+				name = f.Name
+			}
+			candidates[name] = append(candidates[name], candidate{f, tagged})
+		}
+	}
+	visit(t, nil, map[reflect.Type]bool{})
+	fields := map[string]reflect.StructField{}
+	for name, list := range candidates {
+		sort.Slice(list, func(i, j int) bool {
+			if len(list[i].field.Index) != len(list[j].field.Index) {
+				return len(list[i].field.Index) < len(list[j].field.Index)
+			}
+			return list[i].tagged && !list[j].tagged
+		})
+		if len(list) > 1 && len(list[0].field.Index) == len(list[1].field.Index) && list[0].tagged == list[1].tagged {
+			continue
+		}
+		fields[name] = list[0].field
+	}
+	return fields
+}
--- a/config/config.go
+++ b/config/config.go
@@ -5,6 +5,7 @@ import (
 	"time"

 	"git.yuntuo.hk/k2safe/go-omni/contract"
+	"git.yuntuo.hk/k2safe/go-omni/cors"
 	apierrors "git.yuntuo.hk/k2safe/go-omni/errors"
 	"git.yuntuo.hk/k2safe/go-omni/httpx"
 	"git.yuntuo.hk/k2safe/go-omni/lifecycle"
@@ -28,6 +29,7 @@ type TLSConfig struct {

 // Config controls the default runtime behavior of an App.
 type Config struct {
+	CORS                 cors.Config              `json:"cors"`
 	Request              contract.RequestPolicy   `json:"request"`
 	Address              string                   `json:"address"`
 	Transport            string                   `json:"transport"`
@@ -61,20 +63,23 @@ func Default() Config {

 // Validate checks configuration values before an application starts.
 func (c Config) Validate() error {
+	if err := c.CORS.Validate(); err != nil {
+		return AtField("cors", err)
+	}
 	if err := c.Lifecycle.Validate(); err != nil {
-		return err
+		return AtField("lifecycle", err)
 	}
 	if err := c.Request.Validate(); err != nil {
-		return err
+		return AtField("request", err)
 	}
 	if err := c.Log.Validate(); err != nil {
-		return err
+		return AtField("log", err)
 	}
 	if err := c.Endpoints.Validate(); err != nil {
 		return err
 	}
 	if err := c.Errors.Validate(); err != nil {
-		return err
+		return AtField("errors", err)
 	}
 	encoder := c.ResponseEncoder
 	if encoder == nil {
@@ -90,7 +95,7 @@ func (c Config) Validate() error {
 		return err
 	}
 	if err := c.Response.Validate(); err != nil {
-		return err
+		return AtField("response", err)
 	}
 	if c.SlowRequestThreshold < 0 {
 		return &ConfigError{Field: "slowRequestThreshold", Message: "must be nonnegative"}
@@ -99,13 +104,13 @@ func (c Config) Validate() error {
 		return &ConfigError{Field: "address", Message: "is required"}
 	}
 	if strings.TrimSpace(c.RequestIDHeader) == "" {
-		return &ConfigError{Field: "request_id_header", Message: "is required"}
+		return &ConfigError{Field: "requestIdHeader", Message: "is required"}
 	}
 	if c.ShutdownTimeout <= 0 {
-		return &ConfigError{Field: "shutdown_timeout", Message: "must be positive"}
+		return &ConfigError{Field: "shutdownTimeout", Message: "must be positive"}
 	}
 	if _, err := httpx.NewClientIPResolver(c.TrustedProxies...); err != nil {
-		return &ConfigError{Field: "trusted_proxies", Message: err.Error()}
+		return &Error{Field: "trustedProxies", Reason: "expected IP addresses or CIDRs", cause: err}
 	}
 	return c.ValidateTransport()
 }
@@ -188,12 +193,14 @@ func WithTrustedProxies(proxies ...string) Option {
 // WithConfig applies a complete configuration loaded from a file or
 // environment. Later options can still override individual fields.
 func WithConfig(settings Config) Option {
+	settings.CORS = settings.CORS.Clone()
 	settings.Response = settings.Response.Clone()
 	settings.Errors = settings.Errors.Clone()
 	settings.TrustedProxies = append([]string(nil), settings.TrustedProxies...)
 	settings.Log.RedactKeys = append([]string(nil), settings.Log.RedactKeys...)
 	return func(cfg *Config) {
 		*cfg = settings
+		cfg.CORS = settings.CORS.Clone()
 		cfg.Response = settings.Response.Clone()
 		cfg.Errors = settings.Errors.Clone()
 		cfg.TrustedProxies = append([]string(nil), settings.TrustedProxies...)
@@ -201,6 +208,12 @@ func WithConfig(settings Config) Option {
 	}
 }

+// WithCORS installs an app-local CORS policy, before routing and authentication.
+func WithCORS(settings cors.Config) Option {
+	settings = settings.Clone()
+	return func(cfg *Config) { cfg.CORS = settings.Clone() }
+}
+
 // WithResponse configures this application's default JSON envelope.
 func WithResponse(settings response.Config) Option {
 	settings = settings.Clone()
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -1,132 +1,6 @@
 package config

-import (
-	"strings"
-	"testing"
-	"time"
-)
-
-func TestLoadFromEnvUsesDefaults(t *testing.T) {
-	for _, key := range []string{
-		"GO_OMNI_HTTP_ADDR", "GO_OMNI_REQUEST_ID_HEADER", "GO_OMNI_ENABLE_LOGGER",
-		"GO_OMNI_TRUSTED_PROXIES",
-		"GO_OMNI_TRANSPORT", "GO_OMNI_TLS_CERT_FILE", "GO_OMNI_TLS_KEY_FILE",
-		"GO_OMNI_LOG_LEVEL", "GO_OMNI_LOG_FORMAT", "GO_OMNI_LOG_OUTPUT",
-		"GO_OMNI_LOG_FILE", "GO_OMNI_SERVICE", "GO_OMNI_ENVIRONMENT",
-		"GO_OMNI_LOG_ADD_SOURCE", "GO_OMNI_SHUTDOWN_TIMEOUT",
-		"GO_OMNI_SLOW_REQUEST_THRESHOLD",
-	} {
-		t.Setenv(key, "")
-	}
-
-	cfg, err := LoadFromEnv("")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if cfg.Address != ":8080" || cfg.Transport != TransportNetHTTP || cfg.TLS != (TLSConfig{}) || cfg.RequestIDHeader != "X-Request-ID" || cfg.ShutdownTimeout != 10*time.Second {
-		t.Fatalf("unexpected defaults: %+v", cfg)
-	}
-	if cfg.EnableLogger || cfg.Log.Level != "info" || cfg.Log.Format != "json" || cfg.Log.Output != "stderr" {
-		t.Fatalf("unexpected logger defaults: %+v", cfg.Log)
-	}
-}
-
-func TestTransportEnvironment(t *testing.T) {
-	for _, test := range []struct {
-		name, transport, cert, key, errorField string
-	}{
-		{"default", "", "", "", ""},
-		{"native", "native", "", "", ""},
-		{"nativeTLS", "native", "server.crt", "server.key", ""},
-		{"http2", "http2", "server.crt", "server.key", ""},
-		{"unknown", "typo", "", "", "transport"},
-		{"certOnly", "nethttp", "server.crt", "", "tls"},
-		{"keyOnly", "native", "", "server.key", "tls"},
-		{"http2WithoutTLS", "http2", "", "", "tls"},
-	} {
-		t.Run(test.name, func(t *testing.T) {
-			t.Setenv("TRANSPORT_TEST_TRANSPORT", test.transport)
-			t.Setenv("TRANSPORT_TEST_TLS_CERT_FILE", test.cert)
-			t.Setenv("TRANSPORT_TEST_TLS_KEY_FILE", test.key)
-			cfg, err := LoadFromEnv("TRANSPORT_TEST_")
-			if test.errorField != "" {
-				if err == nil || !strings.Contains(err.Error(), test.errorField) {
-					t.Fatalf("unexpected error: %v", err)
-				}
-				return
-			}
-			if err != nil {
-				t.Fatal(err)
-			}
-			want := test.transport
-			if want == "" {
-				want = TransportNetHTTP
-			}
-			if cfg.Transport != want || cfg.TLS.CertFile != test.cert || cfg.TLS.KeyFile != test.key {
-				t.Fatalf("settings: %+v", cfg)
-			}
-		})
-	}
-}
-
-func TestLoadFromEnvOverridesSettings(t *testing.T) {
-	t.Setenv("GO_OMNI_HTTP_ADDR", "127.0.0.1:9090")
-	t.Setenv("GO_OMNI_REQUEST_ID_HEADER", "X-Correlation-ID")
-	t.Setenv("GO_OMNI_TRUSTED_PROXIES", "127.0.0.1, 10.0.0.0/8")
-	t.Setenv("GO_OMNI_ENABLE_LOGGER", "true")
-	t.Setenv("GO_OMNI_LOG_LEVEL", "debug")
-	t.Setenv("GO_OMNI_LOG_FORMAT", "text")
-	t.Setenv("GO_OMNI_LOG_OUTPUT", "stdout")
-	t.Setenv("GO_OMNI_SERVICE", "billing")
-	t.Setenv("GO_OMNI_ENVIRONMENT", "test")
-	t.Setenv("GO_OMNI_LOG_ADD_SOURCE", "true")
-	t.Setenv("GO_OMNI_SHUTDOWN_TIMEOUT", "3s")
-	t.Setenv("GO_OMNI_SLOW_REQUEST_THRESHOLD", "500ms")
-
-	cfg, err := LoadFromEnv("")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if cfg.Address != "127.0.0.1:9090" || cfg.RequestIDHeader != "X-Correlation-ID" || !cfg.EnableLogger || len(cfg.TrustedProxies) != 2 || cfg.TrustedProxies[1] != "10.0.0.0/8" {
-		t.Fatalf("unexpected application settings: %+v", cfg)
-	}
-	if cfg.ShutdownTimeout != 3*time.Second || cfg.Log.Level != "debug" || cfg.Log.Format != "text" || cfg.Log.Output != "stdout" || cfg.Log.Service != "billing" || cfg.Log.Environment != "test" || !cfg.Log.AddSource {
-		t.Fatalf("unexpected logger settings: %+v", cfg.Log)
-	}
-	if cfg.SlowRequestThreshold != 500*time.Millisecond {
-		t.Fatal(cfg.SlowRequestThreshold)
-	}
-}
-
-func TestLoadFromEnvRejectsInvalidValues(t *testing.T) {
-	t.Setenv("GO_OMNI_ENABLE_LOGGER", "sometimes")
-	if _, err := LoadFromEnv(""); err == nil || !strings.Contains(err.Error(), "ENABLE_LOGGER") {
-		t.Fatalf("expected invalid logger flag error, got %v", err)
-	}
-
-	t.Setenv("GO_OMNI_ENABLE_LOGGER", "")
-	t.Setenv("GO_OMNI_SHUTDOWN_TIMEOUT", "later")
-	if _, err := LoadFromEnv(""); err == nil || !strings.Contains(err.Error(), "SHUTDOWN_TIMEOUT") {
-		t.Fatalf("expected invalid timeout error, got %v", err)
-	}
-
-	t.Setenv("GO_OMNI_SHUTDOWN_TIMEOUT", "1s")
-	t.Setenv("GO_OMNI_TRUSTED_PROXIES", "proxy.example.com")
-	if _, err := LoadFromEnv(""); err == nil || !strings.Contains(err.Error(), "trusted_proxies") {
-		t.Fatalf("expected invalid trusted proxy error, got %v", err)
-	}
-	t.Setenv("GO_OMNI_TRUSTED_PROXIES", "")
-	cfg := Default()
-	cfg.Address = ""
-	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "address") {
-		t.Fatalf("expected invalid address error, got %v", err)
-	}
-	cfg = Default()
-	cfg.RequestIDHeader = " "
-	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "request_id_header") {
-		t.Fatalf("expected invalid request header error, got %v", err)
-	}
-}
+import "testing"

 func TestWithConfigAndWithLogConfig(t *testing.T) {
 	settings := Default()
@@ -147,23 +21,3 @@ func TestWithConfigAndWithLogConfig(t *testing.T) {
 		t.Fatalf("log config was not replaced: %+v", cfg.Log)
 	}
 }
-
-func TestApplyEnvPreservesProjectDefaults(t *testing.T) {
-	cfg := Default()
-	cfg.Address = "127.0.0.1:8123"
-	cfg.Log.RedactKeys = []string{"bankAccount"}
-	cfg.TrustedProxies = []string{"127.0.0.1"}
-	t.Setenv("OVERLAY_TEST_LOG_LEVEL", "debug")
-	got, err := ApplyEnv(cfg, "OVERLAY_TEST_")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if got.Address != cfg.Address || got.Log.Level != "debug" {
-		t.Fatal(got)
-	}
-	got.Log.RedactKeys[0] = "changed"
-	got.TrustedProxies[0] = "192.0.2.1"
-	if cfg.Log.RedactKeys[0] != "bankAccount" || cfg.TrustedProxies[0] != "127.0.0.1" {
-		t.Fatal("caller-owned defaults mutated")
-	}
-}
--- a/config/cors_test.go
+++ b/config/cors_test.go
@@ -0,0 +1,51 @@
+package config_test
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/config"
+)
+
+type corsProject struct {
+	Server config.Config `json:"server"`
+}
+
+func (c corsProject) Validate() error { return config.AtField("server", c.Server.Validate()) }
+
+func TestCORSConfiguration(t *testing.T) {
+	t.Setenv("WEB_ORIGIN", "https://web.example")
+	for ext, source := range map[string]string{
+		"yaml": "server:\n  cors:\n    enabled: true\n    allowedOrigins:\n      - '${WEB_ORIGIN}'\n    allowedMethods: [GET, POST]\n    allowedHeaders: [Authorization, Content-Type]\n    maxAge: 10m\n",
+		"json": `{"server":{"cors":{"enabled":true,"allowedOrigins":["${WEB_ORIGIN}"],"allowedMethods":["GET","POST"],"allowedHeaders":["Authorization","Content-Type"],"maxAge":"10m"}}}`,
+		"xml":  `<config><server><cors><enabled type="bool">true</enabled><allowedOrigins type="array"><item>${WEB_ORIGIN}</item></allowedOrigins><allowedMethods type="array"><item>GET</item><item>POST</item></allowedMethods><allowedHeaders type="array"><item>Authorization</item><item>Content-Type</item></allowedHeaders><maxAge>10m</maxAge></cors></server></config>`,
+	} {
+		t.Run(ext, func(t *testing.T) {
+			path := filepath.Join(t.TempDir(), "config."+ext)
+			if err := os.WriteFile(path, []byte(source), 0600); err != nil {
+				t.Fatal(err)
+			}
+			cfg, err := config.LoadProject(path, corsProject{Server: config.Default()})
+			if err != nil {
+				t.Fatal(err)
+			}
+			if !cfg.Server.CORS.Enabled || cfg.Server.CORS.AllowedOrigins[0] != "https://web.example" || cfg.Server.CORS.MaxAge != 10*time.Minute {
+				t.Fatal(cfg.Server.CORS)
+			}
+		})
+	}
+	path := filepath.Join(t.TempDir(), "bad.yaml")
+	if err := os.WriteFile(path, []byte("server:\n  cors:\n    enabled: true\n    allowedOrigins:\n      - '${WEB_ORIGIN}'\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv("WEB_ORIGIN", "https://user:secret@web.example")
+	_, err := config.LoadProject(path, corsProject{Server: config.Default()})
+	var d *config.Error
+	if !errors.As(err, &d) || d.Field != "server.cors.allowedOrigins[0]" || d.Env != "WEB_ORIGIN" || d.Line != 5 || strings.Contains(err.Error(), "secret") {
+		t.Fatal(err)
+	}
+}
--- a/config/decoders.go
+++ b/config/decoders.go
@@ -0,0 +1,398 @@
+package config
+
+import (
+	"bytes"
+	"encoding/json"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+
+	"gopkg.in/yaml.v3"
+)
+
+type JSONDecoder struct{}
+type YAMLDecoder struct{}
+type XMLDecoder struct{}
+
+type parseState struct {
+	doc   Document
+	nodes int
+}
+
+func newParseState() *parseState { return &parseState{doc: Document{Positions: map[string]Position{}}} }
+func (p *parseState) enter(path string, pos Position, depth int) error {
+	p.nodes++
+	p.doc.Positions[path] = pos
+	if depth > maxConfigDepth || p.nodes > maxConfigNodes {
+		return p.doc.diagnostic(path, "configuration nesting or node limit exceeded", nil)
+	}
+	return nil
+}
+
+type sourcePositions struct{ starts []int }
+
+func newSourcePositions(data []byte) sourcePositions {
+	p := sourcePositions{starts: []int{0}}
+	for i, c := range data {
+		if c == '\n' {
+			p.starts = append(p.starts, i+1)
+		}
+	}
+	return p
+}
+func (p sourcePositions) at(offset int64) Position {
+	if offset < 0 {
+		offset = 0
+	}
+	i := sort.Search(len(p.starts), func(i int) bool { return int64(p.starts[i]) > offset }) - 1
+	return Position{Line: i + 1, Column: int(offset) - p.starts[i] + 1}
+}
+
+var yamlLine = regexp.MustCompile(`line ([0-9]+)`)
+
+func yamlSyntax(err error) *Error {
+	d := &Error{Reason: "invalid YAML syntax", cause: err}
+	if m := yamlLine.FindStringSubmatch(err.Error()); len(m) == 2 {
+		d.Line, _ = strconv.Atoi(m[1])
+		d.Column = 1
+	}
+	return d
+}
+func (JSONDecoder) Decode(data []byte) (Document, error) {
+	p := newParseState()
+	if len(data) > maxConfigBytes {
+		return p.doc, &Error{Reason: "file exceeds 1 MiB"}
+	}
+	if !utf8.Valid(data) {
+		return p.doc, &Error{Reason: "configuration must be UTF-8"}
+	}
+	positions := newSourcePositions(data)
+	d := json.NewDecoder(bytes.NewReader(data))
+	d.UseNumber()
+	var parse func(string, int) (any, error)
+	parse = func(path string, depth int) (any, error) {
+		offset := d.InputOffset()
+		for offset < int64(len(data)) && strings.ContainsRune(" \t\r\n:,", rune(data[offset])) {
+			offset++
+		}
+		if err := p.enter(path, positions.at(offset), depth); err != nil {
+			return nil, err
+		}
+		token, err := d.Token()
+		if err != nil {
+			pos := positions.at(d.InputOffset())
+			var syntax *json.SyntaxError
+			if errors.As(err, &syntax) {
+				pos = positions.at(syntax.Offset - 1)
+			}
+			return nil, &Error{Field: path, Line: pos.Line, Column: pos.Column, Reason: "invalid JSON syntax", cause: err}
+		}
+		if delim, ok := token.(json.Delim); ok {
+			switch delim {
+			case '{':
+				out := map[string]any{}
+				for d.More() {
+					k, e := d.Token()
+					if e != nil {
+						return nil, p.doc.diagnostic(path, "invalid object key", e)
+					}
+					key, ok := k.(string)
+					if !ok {
+						return nil, p.doc.diagnostic(path, "object key must be a string", nil)
+					}
+					child := joinField(path, key)
+					if _, exists := out[key]; exists {
+						return nil, p.doc.diagnostic(child, "duplicate field", nil)
+					}
+					out[key], e = parse(child, depth+1)
+					if e != nil {
+						return nil, e
+					}
+				}
+				if _, err = d.Token(); err != nil {
+					return nil, p.doc.diagnostic(path, "unterminated object", err)
+				}
+				return out, nil
+			case '[':
+				out := []any{}
+				for d.More() {
+					v, e := parse(fmt.Sprintf("%s[%d]", path, len(out)), depth+1)
+					if e != nil {
+						return nil, e
+					}
+					out = append(out, v)
+				}
+				if _, err = d.Token(); err != nil {
+					return nil, p.doc.diagnostic(path, "unterminated array", err)
+				}
+				return out, nil
+			default:
+				return nil, p.doc.diagnostic(path, "unexpected JSON delimiter", nil)
+			}
+		}
+		return token, nil
+	}
+	var err error
+	p.doc.Value, err = parse("", 0)
+	if err == nil {
+		if _, e := d.Token(); e != io.EOF {
+			err = p.doc.diagnostic("", "exactly one JSON document required", e)
+		}
+	}
+	return p.doc, err
+}
+
+func (YAMLDecoder) Decode(data []byte) (Document, error) {
+	p := newParseState()
+	if len(data) > maxConfigBytes {
+		return p.doc, &Error{Reason: "file exceeds 1 MiB"}
+	}
+	if !utf8.Valid(data) {
+		return p.doc, &Error{Reason: "configuration must be UTF-8"}
+	}
+	d := yaml.NewDecoder(bytes.NewReader(data))
+	var root yaml.Node
+	if err := d.Decode(&root); err != nil {
+		return p.doc, yamlSyntax(err)
+	}
+	var extra yaml.Node
+	if err := d.Decode(&extra); err != io.EOF {
+		return p.doc, &Error{Reason: "exactly one YAML document required", cause: err}
+	}
+	var walk func(*yaml.Node, string, int) (any, error)
+	walk = func(n *yaml.Node, path string, depth int) (any, error) {
+		if err := p.enter(path, Position{n.Line, n.Column}, depth); err != nil {
+			return nil, err
+		}
+		switch n.Kind {
+		case yaml.MappingNode:
+			out := map[string]any{}
+			for i := 0; i < len(n.Content); i += 2 {
+				k, v := n.Content[i], n.Content[i+1]
+				if k.Tag != "!!str" {
+					return nil, p.doc.diagnostic(path, "mapping keys must be strings; merge keys are not supported", nil)
+				}
+				child := joinField(path, k.Value)
+				if _, ok := out[k.Value]; ok {
+					return nil, &Error{Field: child, Line: k.Line, Column: k.Column, Reason: "duplicate field"}
+				}
+				x, err := walk(v, child, depth+1)
+				if err != nil {
+					return nil, err
+				}
+				out[k.Value] = x
+			}
+			return out, nil
+		case yaml.SequenceNode:
+			out := make([]any, len(n.Content))
+			for i, c := range n.Content {
+				var err error
+				out[i], err = walk(c, fmt.Sprintf("%s[%d]", path, i), depth+1)
+				if err != nil {
+					return nil, err
+				}
+			}
+			return out, nil
+		case yaml.AliasNode:
+			return nil, p.doc.diagnostic(path, "YAML aliases are not supported", nil)
+		case yaml.ScalarNode:
+			switch n.Tag {
+			case "!!str", "!!timestamp":
+				return n.Value, nil
+			case "!!null":
+				return nil, nil
+			case "!!bool", "!!int", "!!float":
+				var v any
+				if err := n.Decode(&v); err != nil {
+					return nil, p.doc.diagnostic(path, "invalid YAML scalar", err)
+				}
+				raw, err := json.Marshal(v)
+				if err != nil {
+					return nil, p.doc.diagnostic(path, "number must be finite", err)
+				}
+				var out any
+				dec := json.NewDecoder(bytes.NewReader(raw))
+				dec.UseNumber()
+				if err = dec.Decode(&out); err != nil {
+					return nil, p.doc.diagnostic(path, "invalid YAML scalar", err)
+				}
+				return out, nil
+			default:
+				return nil, p.doc.diagnostic(path, "unsupported YAML tag", nil)
+			}
+		}
+		return nil, p.doc.diagnostic(path, "unsupported YAML node", nil)
+	}
+	if len(root.Content) != 1 {
+		return p.doc, &Error{Reason: "one nonempty YAML document required"}
+	}
+	var err error
+	p.doc.Value, err = walk(root.Content[0], "", 0)
+	return p.doc, err
+}
+
+// XML uses a config root, element field names, type="array" with item children,
+// type="object" for empty objects, and type="null" for explicit null. Scalar
+// text is bound using the destination type; optional number/bool/string types
+// let dynamic any values preserve their intended JSON type.
+func (XMLDecoder) Decode(data []byte) (Document, error) {
+	p := newParseState()
+	if len(data) > maxConfigBytes {
+		return p.doc, &Error{Reason: "file exceeds 1 MiB"}
+	}
+	if !utf8.Valid(data) {
+		return p.doc, &Error{Reason: "configuration must be UTF-8"}
+	}
+	d := xml.NewDecoder(bytes.NewReader(data))
+	var parse func(xml.StartElement, string, int, Position) (any, error)
+	parse = func(start xml.StartElement, path string, depth int, pos Position) (any, error) {
+		if err := p.enter(path, pos, depth); err != nil {
+			return nil, err
+		}
+		if start.Name.Space != "" {
+			return nil, p.doc.diagnostic(path, "XML namespaces are not supported", nil)
+		}
+		kind := ""
+		attrSeen := false
+		for _, a := range start.Attr {
+			if a.Name.Space != "" || a.Name.Local != "type" || attrSeen {
+				return nil, p.doc.diagnostic(path, "only one XML type attribute is supported", nil)
+			}
+			kind = a.Value
+			attrSeen = true
+		}
+		if depth == 0 && kind == "" {
+			kind = "object"
+		}
+		switch kind {
+		case "", "object", "array", "null", "string", "number", "bool":
+		default:
+			return nil, p.doc.diagnostic(path, "unsupported XML type", nil)
+		}
+		children := map[string]any{}
+		array := []any{}
+		var text strings.Builder
+		for {
+			line, column := d.InputPos()
+			token, err := d.Token()
+			if err != nil {
+				return nil, &Error{Field: path, Line: line, Column: column, Reason: "invalid XML syntax", cause: err}
+			}
+			switch x := token.(type) {
+			case xml.StartElement:
+				if kind != "" && kind != "object" && kind != "array" {
+					return nil, p.doc.diagnostic(path, "scalar XML element cannot contain children", nil)
+				}
+				child := joinField(path, x.Name.Local)
+				if kind == "array" {
+					if x.Name.Local != "item" {
+						return nil, p.doc.diagnostic(path, "XML array children must be item elements", nil)
+					}
+					child = fmt.Sprintf("%s[%d]", path, len(array))
+				} else if _, ok := children[x.Name.Local]; ok {
+					return nil, p.doc.diagnostic(child, "duplicate field; use type=\"array\" for lists", nil)
+				}
+				v, e := parse(x, child, depth+1, Position{line, column})
+				if e != nil {
+					return nil, e
+				}
+				if kind == "array" {
+					array = append(array, v)
+				} else {
+					children[x.Name.Local] = v
+				}
+			case xml.CharData:
+				text.Write([]byte(x))
+			case xml.Comment:
+			case xml.EndElement:
+				raw := text.String()
+				if len(children) > 0 || kind == "array" || kind == "object" {
+					if strings.TrimSpace(raw) != "" {
+						return nil, p.doc.diagnostic(path, "mixed XML text and elements are not supported", nil)
+					}
+					if kind == "array" {
+						return array, nil
+					}
+					return children, nil
+				}
+				switch kind {
+				case "null":
+					if strings.TrimSpace(raw) != "" {
+						return nil, p.doc.diagnostic(path, "null element must be empty", nil)
+					}
+					return nil, nil
+				case "string":
+					return raw, nil
+				case "number":
+					var n any
+					dec := json.NewDecoder(strings.NewReader(strings.TrimSpace(raw)))
+					dec.UseNumber()
+					if err := dec.Decode(&n); err != nil {
+						return nil, p.doc.diagnostic(path, "invalid number", err)
+					}
+					if _, ok := n.(json.Number); !ok {
+						return nil, p.doc.diagnostic(path, "expected number", nil)
+					}
+					if _, e := dec.Token(); e != io.EOF {
+						return nil, p.doc.diagnostic(path, "invalid number", e)
+					}
+					return n, nil
+				case "bool":
+					b, e := strconv.ParseBool(strings.TrimSpace(raw))
+					if e != nil {
+						return nil, p.doc.diagnostic(path, "expected boolean", e)
+					}
+					return b, nil
+				}
+				return Text(raw), nil
+			default:
+				return nil, p.doc.diagnostic(path, "XML directives and processing instructions are not supported", nil)
+			}
+		}
+	}
+	found := false
+	prolog := false
+	for {
+		line, column := d.InputPos()
+		token, err := d.Token()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return p.doc, &Error{Line: line, Column: column, Reason: "invalid XML syntax", cause: err}
+		}
+		switch x := token.(type) {
+		case xml.StartElement:
+			if found || x.Name.Local != "config" {
+				return p.doc, &Error{Line: line, Column: column, Reason: "exactly one config root required"}
+			}
+			found = true
+			p.doc.Value, err = parse(x, "", 0, Position{line, column})
+			if err != nil {
+				return p.doc, err
+			}
+		case xml.CharData:
+			if strings.TrimSpace(string(x)) != "" {
+				return p.doc, &Error{Reason: "unexpected text outside XML root"}
+			}
+		case xml.Comment:
+		case xml.ProcInst:
+			if found || prolog || x.Target != "xml" {
+				return p.doc, &Error{Reason: "XML processing instructions are not supported"}
+			}
+			prolog = true
+		default:
+			return p.doc, &Error{Reason: "XML directives are not supported"}
+		}
+	}
+	if !found {
+		return p.doc, &Error{Reason: "config root required"}
+	}
+	return p.doc, nil
+}
--- a/config/diagnostic.go
+++ b/config/diagnostic.go
@@ -0,0 +1,101 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"git.yuntuo.hk/k2safe/go-omni/internal/configdiag"
+)
+
+// Error is a value-free diagnostic. Cause may contain private parser details;
+// errors.Is/As remain available, but Error never formats Cause automatically.
+type Error struct {
+	File, Field, Env, Reason string
+	Line, Column             int
+	cause                    error
+}
+
+func (e *Error) Error() string {
+	where := "config"
+	if e.File != "" {
+		where = fmt.Sprintf("config %q", e.File)
+	}
+	if e.Line > 0 {
+		where += fmt.Sprintf(":%d:%d", e.Line, e.Column)
+	}
+	if e.Env != "" {
+		where += fmt.Sprintf(" env %q", e.Env)
+	}
+	if e.Field != "" {
+		where += fmt.Sprintf(" field %q", e.Field)
+	}
+	return where + ": " + e.Reason
+}
+func (e *Error) Unwrap() error { return e.cause }
+
+// DecodeError is retained for callers of errors.As from earlier releases.
+type DecodeError = Error
+
+// Invalid reports a public, value-free validation reason for a configuration field.
+func Invalid(field, reason string) error { return &ConfigError{Field: field, Message: reason} }
+
+// AtField prefixes a nested validation error without losing its original cause.
+// Unstructured validation errors are deliberately not echoed; use Invalid when
+// a custom validator needs a public reason rather than a private error message.
+func AtField(field string, err error) error {
+	if err == nil {
+		return nil
+	}
+	d := validationError(err)
+	d.Field = joinField(field, d.Field)
+	return d
+}
+func validationError(err error) *Error {
+	var d *Error
+	if errors.As(err, &d) {
+		out := *d
+		out.cause = err
+		return &out
+	}
+	var nested *configdiag.Error
+	if errors.As(err, &nested) {
+		return &Error{Field: nested.Field, Reason: nested.Reason, cause: err}
+	}
+	var c *ConfigError
+	if errors.As(err, &c) {
+		return &Error{Field: c.Field, Reason: c.Message, cause: err}
+	}
+	return &Error{Reason: "validation failed", cause: err}
+}
+func joinField(parent, child string) string {
+	if parent == "" {
+		return child
+	}
+	if child == "" {
+		return parent
+	}
+	if strings.HasPrefix(child, "[") {
+		return parent + child
+	}
+	return parent + "." + child
+}
+
+// Position uses one-based source line/column numbers. Zero means unavailable.
+type Position struct{ Line, Column int }
+
+// Document is the common decoder result. Values use JSON-compatible data:
+// string, bool, json.Number, nil, []any, map[string]any. Text is available for
+// formats such as XML whose scalar tokens have no inherent JSON type.
+type Document struct {
+	Value        any
+	Positions    map[string]Position
+	environments map[string][]string
+}
+
+type Text string
+
+func (d Document) diagnostic(field, reason string, cause error) *Error {
+	p := d.Positions[field]
+	return &Error{Field: field, Reason: reason, Line: p.Line, Column: p.Column, cause: cause}
+}
--- a/config/endpoints_test.go
+++ b/config/endpoints_test.go
@@ -18,14 +18,15 @@ func TestEndpointConfiguration(t *testing.T) {
 	if cfg.Endpoints.Liveness.Enabled || cfg.Endpoints.OpenAPI.Enabled || !cfg.Endpoints.Readiness.Enabled || cfg.Endpoints.Readiness.ResponseMode != "raw" {
 		t.Fatal(cfg.Endpoints)
 	}
+	refs := configFile(t, "yaml", "endpoints:\n  readiness:\n    path: ${TEST_ENDPOINTS_READINESS_PATH}\n  openapi:\n    enabled: ${TEST_ENDPOINTS_OPENAPI_ENABLED}\n")
 	t.Setenv("TEST_ENDPOINTS_READINESS_PATH", "/internal/ready")
 	t.Setenv("TEST_ENDPOINTS_OPENAPI_ENABLED", "true")
-	cfg, err = ApplyEnv(cfg, "TEST_")
+	cfg, err = LoadProject(refs, cfg)
 	if err != nil || cfg.Endpoints.Readiness.Path != "/internal/ready" || !cfg.Endpoints.OpenAPI.Enabled {
 		t.Fatal(cfg.Endpoints, err)
 	}
 	t.Setenv("TEST_ENDPOINTS_OPENAPI_ENABLED", "invalid")
-	if _, err = ApplyEnv(cfg, "TEST_"); err == nil {
+	if _, err = LoadProject(refs, cfg); err == nil {
 		t.Fatal("invalid bool accepted")
 	}
 }
--- a/config/env.go
+++ b/config/env.go
@@ -1,83 +0,0 @@
-package config
-
-import (
-	"encoding/json"
-	"os"
-	"strings"
-)
-
-const defaultEnvPrefix = "GO_OMNI_"
-
-// ServerEnvAliases returns the documented short names for Config fields.
-// field is the JSON path of Config in a project (usually "server"), or ""
-// for Config itself. Canonical names win over aliases. Both use the same
-// EnvOptions.Empty/Lookup and typed parser; collections use JSON syntax.
-func ServerEnvAliases(prefix, field string) map[string][]string {
-	root := prefix
-	if field != "" {
-		for _, part := range strings.Split(field, ".") {
-			root += envName(part) + "_"
-		}
-	}
-	names := map[string]string{
-		"ADDRESS": "HTTP_ADDR", "TRANSPORT": "TRANSPORT", "TLS_CERT_FILE": "TLS_CERT_FILE", "TLS_KEY_FILE": "TLS_KEY_FILE",
-		"REQUEST_ID_HEADER": "REQUEST_ID_HEADER", "ENABLE_LOGGER": "ENABLE_LOGGER", "SLOW_REQUEST_THRESHOLD": "SLOW_REQUEST_THRESHOLD",
-		"TRUSTED_PROXIES": "TRUSTED_PROXIES", "SHUTDOWN_TIMEOUT": "SHUTDOWN_TIMEOUT",
-		"LOG_LEVEL": "LOG_LEVEL", "LOG_FORMAT": "LOG_FORMAT", "LOG_OUTPUT": "LOG_OUTPUT", "LOG_FILE": "LOG_FILE", "LOG_SERVICE": "SERVICE", "LOG_ENVIRONMENT": "ENVIRONMENT", "LOG_ADD_SOURCE": "LOG_ADD_SOURCE",
-		"HTTP_READ_HEADER_TIMEOUT": "HTTP_READ_HEADER_TIMEOUT", "HTTP_READ_TIMEOUT": "HTTP_READ_TIMEOUT", "HTTP_WRITE_TIMEOUT": "HTTP_WRITE_TIMEOUT", "HTTP_IDLE_TIMEOUT": "HTTP_IDLE_TIMEOUT", "HTTP_MAX_HEADER_BYTES": "HTTP_MAX_HEADER_BYTES",
-		"LIFECYCLE_STOP_TIMEOUT": "LIFECYCLE_STOP_TIMEOUT", "LIFECYCLE_DRAIN_TIMEOUT": "LIFECYCLE_DRAIN_TIMEOUT", "LIFECYCLE_CANCEL_TIMEOUT": "LIFECYCLE_CANCEL_TIMEOUT",
-	}
-	for _, endpoint := range []string{"LIVENESS", "READINESS", "OPENAPI"} {
-		for _, part := range []string{"ENABLED", "PATH", "RESPONSE_MODE"} {
-			if endpoint == "OPENAPI" && part == "RESPONSE_MODE" {
-				continue
-			}
-			name := "ENDPOINTS_" + endpoint + "_" + part
-			names[name] = name
-		}
-	}
-	aliases := map[string][]string{}
-	for key, alias := range names {
-		if root+key != prefix+alias {
-			aliases[root+key] = []string{prefix + alias}
-		}
-	}
-	return aliases
-}
-
-// LoadFromEnv loads defaults using the legacy short-name conventions.
-func LoadFromEnv(prefix string) (Config, error) { return ApplyEnv(Default(), prefix) }
-
-// ApplyEnv retains legacy whitespace trimming, ignored empty variables and
-// comma-separated TRUSTED_PROXIES. New projects should use OverlayEnv with
-// ServerEnvAliases for one explicit empty-value policy across the whole config.
-func ApplyEnv(defaults Config, prefix string) (Config, error) {
-	prefix = strings.TrimSpace(prefix)
-	if prefix == "" {
-		prefix = defaultEnvPrefix
-	}
-	lookup := func(key string) (string, bool) {
-		raw, ok := os.LookupEnv(key)
-		raw = strings.TrimSpace(raw)
-		if ok && raw != "" && key == prefix+"TRUSTED_PROXIES" && !strings.HasPrefix(raw, "[") {
-			values := strings.Split(raw, ",")
-			for i := range values {
-				values[i] = strings.TrimSpace(values[i])
-			}
-			data, _ := json.Marshal(values)
-			raw = string(data)
-		}
-		return raw, ok
-	}
-	defaults.Errors = defaults.Errors.Clone()
-	defaults.TrustedProxies = append([]string(nil), defaults.TrustedProxies...)
-	defaults.Log.RedactKeys = append([]string(nil), defaults.Log.RedactKeys...)
-	cfg, err := OverlayEnv(defaults, EnvOptions{Prefix: prefix, Empty: "ignore", Lookup: lookup, Aliases: ServerEnvAliases(prefix, "")})
-	if err != nil {
-		return Config{}, err
-	}
-	if err = cfg.Validate(); err != nil {
-		return Config{}, err
-	}
-	return cfg, nil
-}
--- a/config/errorCatalog_test.go
+++ b/config/errorCatalog_test.go
@@ -21,7 +21,7 @@ func TestCatalogConfigFiles(t *testing.T) {
 			if err := os.WriteFile(path, []byte(file.body), 0600); err != nil {
 				t.Fatal(err)
 			}
-			cfg, err := config.LoadFile(path, "CATALOG_FIXTURE_")
+			cfg, err := config.LoadFile(path)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -40,7 +40,7 @@ func TestCatalogConfigFiles(t *testing.T) {
 		if err := os.WriteFile(path, []byte(body), 0600); err != nil {
 			t.Fatal(err)
 		}
-		if _, err := config.LoadFile(path, "CATALOG_FIXTURE_"); err == nil {
+		if _, err := config.LoadFile(path); err == nil {
 			t.Fatal("accepted invalid catalog", body)
 		}
 	}
@@ -57,7 +57,7 @@ func TestCatalogReloadSnapshotIsolation(t *testing.T) {
 		t.Fatal(err)
 	}
 	defer logger.Close()
-	reloader, err := config.NewReloader(path, "CATALOG_RELOAD_", logger)
+	reloader, err := config.NewReloader(path, logger)
 	if err != nil {
 		t.Fatal(err)
 	}
--- a/config/errorParams_test.go
+++ b/config/errorParams_test.go
@@ -20,7 +20,7 @@ func TestTemplateConfigFiles(t *testing.T) {
 			if err := os.WriteFile(path, []byte(file.body), 0600); err != nil {
 				t.Fatal(err)
 			}
-			cfg, err := config.LoadFile(path, "TEMPLATE_TEST_")
+			cfg, err := config.LoadFile(path)
 			if err != nil {
 				t.Fatal(err)
 			}
--- a/config/file.go
+++ b/config/file.go
@@ -1,190 +1,41 @@
 package config

 import (
-	"bytes"
 	"context"
-	"encoding/json"
 	"errors"
-	"io"
-	"os"
-	"path/filepath"
 	"reflect"
-	"strings"
 	"sync"
 	"time"

-	apierrors "git.yuntuo.hk/k2safe/go-omni/errors"
 	"git.yuntuo.hk/k2safe/go-omni/logx"
-	"gopkg.in/yaml.v3"
 )

-// DecodeFile merges a bounded JSON/YAML document into defaults. It uses JSON
-// field names for both formats, rejects unknown fields and accepts durations
-// such as "3s". Application-specific validation remains with the caller.
-func DecodeFile[T any](path string, defaults T) (T, error) {
-	result, err := decodeFile(path, defaults)
-	if err != nil {
-		var zero T
-		return zero, &DecodeError{cause: err}
-	}
-	return result, nil
-}
-
-// DecodeError keeps input values out of public diagnostics while preserving
-// errors.Is/As for explicitly handled underlying I/O and syntax errors.
-type DecodeError struct{ cause error }
-
-func (e *DecodeError) Error() string {
-	return "config: cannot decode file; check its path, format, field names and value types"
-}
-func (e *DecodeError) Unwrap() error { return e.cause }
-func decodeFile[T any](path string, defaults T) (T, error) {
-	var zero T
-	f, err := os.Open(path)
-	if err != nil {
-		return zero, err
-	}
-	defer f.Close()
-	data, err := io.ReadAll(io.LimitReader(f, (1<<20)+1))
-	if err != nil {
-		return zero, err
-	}
-	if len(data) > 1<<20 {
-		return zero, errors.New("config: file exceeds 1 MiB")
-	}
-	var value any
-	switch strings.ToLower(filepath.Ext(path)) {
-	case ".yaml", ".yml":
-		dec := yaml.NewDecoder(bytes.NewReader(data))
-		if err := dec.Decode(&value); err != nil {
-			return zero, err
-		}
-		var extra any
-		if err := dec.Decode(&extra); err != io.EOF {
-			return zero, errors.New("config: one YAML document required")
-		}
-	case ".json":
-		if err := apierrors.DecodeCatalogJSON(data, &value); err != nil {
-			return zero, err
-		}
-	default:
-		return zero, errors.New("config: expected .json, .yaml or .yml")
-	}
-	if _, ok := value.(map[string]any); !ok {
-		return zero, errors.New("config: root must be an object")
-	}
-	value, err = durations(value, reflect.TypeOf(defaults))
-	if err != nil {
-		return zero, err
-	}
-	encoded, err := json.Marshal(value)
-	if err != nil {
-		return zero, err
-	}
-	// Clone configuration without serializing borrowed json:"-" capabilities.
-	var result T
-	original, err := cloneConfiguration(reflect.ValueOf(&defaults).Elem(), 0)
-	if err != nil {
-		return zero, err
-	}
-	reflect.ValueOf(&result).Elem().Set(original)
-	dec := json.NewDecoder(bytes.NewReader(encoded))
-	dec.DisallowUnknownFields()
-	if err = dec.Decode(&result); err != nil {
-		return zero, err
-	}
-	return result, nil
-}
-func durations(v any, t reflect.Type) (any, error) {
-	if t == nil {
-		return v, nil
-	}
-	for t.Kind() == reflect.Pointer {
-		t = t.Elem()
-	}
-	if t == reflect.TypeOf(time.Duration(0)) {
-		if s, ok := v.(string); ok {
-			d, err := time.ParseDuration(s)
-			return int64(d), err
-		}
-		return v, nil
-	}
-	if t.Kind() == reflect.Struct {
-		if m, ok := v.(map[string]any); ok {
-			for n := 0; n < t.NumField(); n++ {
-				field := t.Field(n)
-				name := strings.Split(field.Tag.Get("json"), ",")[0]
-				if name == "-" {
-					continue
-				}
-				if name == "" {
-					name = field.Name
-				}
-				if item, exists := m[name]; exists {
-					converted, err := durations(item, field.Type)
-					if err != nil {
-						return nil, err
-					}
-					m[name] = converted
-				}
-			}
-		}
-	}
-	if t.Kind() == reflect.Map && t.Key().Kind() == reflect.String {
-		if values, ok := v.(map[string]any); ok {
-			for key, value := range values {
-				converted, err := durations(value, t.Elem())
-				if err != nil {
-					return nil, err
-				}
-				values[key] = converted
-			}
-		}
-	}
-	if t.Kind() == reflect.Slice {
-		if items, ok := v.([]any); ok {
-			for n, item := range items {
-				converted, err := durations(item, t.Elem())
-				if err != nil {
-					return nil, err
-				}
-				items[n] = converted
-			}
-		}
-	}
-	return v, nil
-}
-func LoadFile(path, prefix string) (Config, error) {
-	cfg, err := DecodeFile(path, Default())
-	if err != nil {
-		return Config{}, err
-	}
-	return ApplyEnv(cfg, prefix)
-}
+// LoadFile loads and validates framework configuration using explicit file references.
+func LoadFile(path string) (Config, error) { return LoadProject(path, Default()) }

 // Reloader only accepts log.level changes. Static changes and invalid files
 // leave the current snapshot and logger untouched. Watch does not own a goroutine.
 type Reloader struct {
-	mu           sync.Mutex
-	path, prefix string
-	current      Config
-	logger       *logx.Logger
+	mu      sync.Mutex
+	path    string
+	current Config
+	logger  *logx.Logger
 }

-func NewReloader(path, prefix string, logger *logx.Logger) (*Reloader, error) {
-	cfg, err := LoadFile(path, prefix)
+func NewReloader(path string, logger *logx.Logger) (*Reloader, error) {
+	cfg, err := LoadFile(path)
 	if err != nil {
 		return nil, err
 	}
 	if err = logger.SetLevel(cfg.Log.Level); err != nil {
 		return nil, err
 	}
-	return &Reloader{path: path, prefix: prefix, current: cfg, logger: logger}, nil
+	return &Reloader{path: path, current: cfg, logger: logger}, nil
 }
 func (r *Reloader) Reload() error {
 	r.mu.Lock()
 	defer r.mu.Unlock()
-	next, err := LoadFile(r.path, r.prefix)
+	next, err := LoadFile(r.path)
 	if err != nil {
 		return err
 	}
--- a/config/file_test.go
+++ b/config/file_test.go
@@ -20,8 +20,8 @@ func TestFileMergeAndSafeReload(t *testing.T) {
 	}
 	write("address: ':8123'\nshutdownTimeout: 7s\nlog:\n  level: info\n")
 	t.Setenv("TEST_MODULE_HTTP_ADDR", ":9123")
-	cfg, err := LoadFile(path, "TEST_MODULE_")
-	if err != nil || cfg.Address != ":9123" || cfg.ShutdownTimeout != 7*time.Second {
+	cfg, err := LoadFile(path)
+	if err != nil || cfg.Address != ":8123" || cfg.ShutdownTimeout != 7*time.Second {
 		t.Fatal(cfg, err)
 	}
 	var output bytes.Buffer
@@ -33,7 +33,7 @@ func TestFileMergeAndSafeReload(t *testing.T) {
 	}
 	defer l.Close()
 	child := l.With("scope", "test")
-	r, err := NewReloader(path, "TEST_MODULE_", l)
+	r, err := NewReloader(path, l)
 	if err != nil {
 		t.Fatal(err)
 	}
--- a/config/http_test.go
+++ b/config/http_test.go
@@ -22,7 +22,7 @@ func TestHTTPFileAndEnvironment(t *testing.T) {
 			if err := os.WriteFile(path, []byte(file.body), 0600); err != nil {
 				t.Fatal(err)
 			}
-			cfg, err := config.LoadFile(path, "HTTP_TEST_")
+			cfg, err := config.LoadFile(path)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -35,7 +35,10 @@ func TestHTTPFileAndEnvironment(t *testing.T) {
 			t.Setenv("HTTP_TEST_HTTP_WRITE_TIMEOUT", "8s")
 			t.Setenv("HTTP_TEST_HTTP_IDLE_TIMEOUT", "9s")
 			t.Setenv("HTTP_TEST_HTTP_MAX_HEADER_BYTES", "16384")
-			got, err := config.ApplyEnv(cfg, "HTTP_TEST_")
+			if err := os.WriteFile(path, []byte(`{"http":{"readHeaderTimeout":"${HTTP_TEST_HTTP_READ_HEADER_TIMEOUT}","readTimeout":"${HTTP_TEST_HTTP_READ_TIMEOUT}","writeTimeout":"${HTTP_TEST_HTTP_WRITE_TIMEOUT}","idleTimeout":"${HTTP_TEST_HTTP_IDLE_TIMEOUT}","maxHeaderBytes":"${HTTP_TEST_HTTP_MAX_HEADER_BYTES}"}}`), 0600); err != nil {
+				t.Fatal(err)
+			}
+			got, err := config.LoadProject(path, cfg)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -55,7 +58,12 @@ func TestHTTPInvalidAndUnsupportedSettings(t *testing.T) {
 					value = "-1s"
 				}
 				t.Setenv("HTTP_INVALID_HTTP_"+key, value)
-				if _, err := config.LoadFromEnv("HTTP_INVALID_"); err == nil {
+				names := map[string]string{"READ_HEADER_TIMEOUT": "readHeaderTimeout", "READ_TIMEOUT": "readTimeout", "WRITE_TIMEOUT": "writeTimeout", "IDLE_TIMEOUT": "idleTimeout", "MAX_HEADER_BYTES": "maxHeaderBytes"}
+				path := filepath.Join(t.TempDir(), "config.json")
+				if err := os.WriteFile(path, []byte(`{"http":{"`+names[key]+`":"${HTTP_INVALID_HTTP_`+key+`}"}}`), 0600); err != nil {
+					t.Fatal(err)
+				}
+				if _, err := config.LoadFile(path); err == nil {
 					t.Fatal("invalid HTTP value accepted")
 				}
 			})
--- a/config/lifecycle_test.go
+++ b/config/lifecycle_test.go
@@ -14,7 +14,7 @@ func TestLifecycleConfiguration(t *testing.T) {
 	if err := os.WriteFile(path, []byte("lifecycle:\n  stopTimeout: 2s\n  drainTimeout: 3s\n  cancelTimeout: 4s\n"), 0600); err != nil {
 		t.Fatal(err)
 	}
-	cfg, err := config.LoadFile(path, "PHASE_TEST_")
+	cfg, err := config.LoadFile(path)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -24,13 +24,16 @@ func TestLifecycleConfiguration(t *testing.T) {
 	for _, key := range []string{"STOP_TIMEOUT", "DRAIN_TIMEOUT", "CANCEL_TIMEOUT"} {
 		t.Setenv("PHASE_TEST_LIFECYCLE_"+key, "6s")
 	}
-	cfg, err = config.ApplyEnv(cfg, "PHASE_TEST_")
+	if err := os.WriteFile(path, []byte("lifecycle:\n  stopTimeout: ${PHASE_TEST_LIFECYCLE_STOP_TIMEOUT}\n  drainTimeout: ${PHASE_TEST_LIFECYCLE_DRAIN_TIMEOUT}\n  cancelTimeout: ${PHASE_TEST_LIFECYCLE_CANCEL_TIMEOUT}\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	cfg, err = config.LoadProject(path, cfg)
 	if err != nil || cfg.Lifecycle.StopTimeout != 6*time.Second || cfg.Lifecycle.DrainTimeout != 6*time.Second || cfg.Lifecycle.CancelTimeout != 6*time.Second {
 		t.Fatal(cfg.Lifecycle, err)
 	}
 	for _, v := range []string{"bad", "-1s"} {
 		t.Setenv("PHASE_TEST_LIFECYCLE_DRAIN_TIMEOUT", v)
-		if _, err := config.ApplyEnv(cfg, "PHASE_TEST_"); err == nil {
+		if _, err := config.LoadProject(path, cfg); err == nil {
 			t.Fatal("invalid duration accepted")
 		}
 	}
--- a/config/loader.go
+++ b/config/loader.go
@@ -0,0 +1,177 @@
+package config
+
+import (
+	"errors"
+	"io"
+	"os"
+	"path/filepath"
+	"reflect"
+	"strings"
+)
+
+const maxConfigBytes = 1 << 20
+const maxConfigDepth = 64
+const maxConfigNodes = 100000
+
+// Decoder must not retain or mutate input and must support concurrent calls
+// when its Loader is shared. It is trusted application code, not a sandbox.
+type Decoder interface {
+	Decode([]byte) (Document, error)
+}
+type DecoderFunc func([]byte) (Document, error)
+
+func (f DecoderFunc) Decode(data []byte) (Document, error) { return f(data) }
+
+// Loader owns an immutable per-instance decoder registry. No global registration.
+type Loader struct {
+	decoders map[string]Decoder
+	sealed   bool
+	lookup   func(string) (string, bool)
+}
+type LoaderOption func(*Loader) error
+
+// WithDecoder adds a new extension; builtin/duplicate extensions cannot be replaced.
+func WithDecoder(extension string, decoder Decoder) LoaderOption {
+	return func(l *Loader) error {
+		if l == nil || l.decoders == nil || l.sealed {
+			return errors.New("config: decoder registry cannot be changed after construction")
+		}
+		ext := strings.ToLower(strings.TrimPrefix(extension, "."))
+		if ext == "" || strings.ContainsAny(ext, "./\\ \t\r\n") {
+			return errors.New("config: invalid decoder extension")
+		}
+		if decoder == nil {
+			return errors.New("config: nil decoder")
+		}
+		v := reflect.ValueOf(decoder)
+		if (v.Kind() == reflect.Pointer || v.Kind() == reflect.Func || v.Kind() == reflect.Map || v.Kind() == reflect.Slice || v.Kind() == reflect.Interface) && v.IsNil() {
+			return errors.New("config: nil decoder")
+		}
+		if _, exists := l.decoders[ext]; exists {
+			return errors.New("config: decoder extension already registered")
+		}
+		l.decoders[ext] = decoder
+		return nil
+	}
+}
+
+func NewLoader(options ...LoaderOption) (*Loader, error) {
+	l := &Loader{lookup: os.LookupEnv, decoders: map[string]Decoder{"json": JSONDecoder{}, "yaml": YAMLDecoder{}, "yml": YAMLDecoder{}, "xml": XMLDecoder{}}}
+	for _, o := range options {
+		if o == nil {
+			return nil, errors.New("config: nil loader option")
+		}
+		if err := o(l); err != nil {
+			return nil, err
+		}
+	}
+	l.sealed = true
+	return l, nil
+}
+
+var defaultLoader, _ = NewLoader()
+
+func selectLoader(loaders []*Loader) (*Loader, error) {
+	if len(loaders) == 0 {
+		return defaultLoader, nil
+	}
+	if len(loaders) != 1 || loaders[0] == nil {
+		return nil, errors.New("config: expected one non-nil loader")
+	}
+	return loaders[0], nil
+}
+func (l *Loader) read(path string) (doc Document, err error) {
+	defer func() {
+		if err != nil {
+			var d *Error
+			if errors.As(err, &d) {
+				c := *d
+				c.File = path
+				err = &c
+			} else {
+				reason := "cannot read configuration file"
+				if errors.Is(err, os.ErrNotExist) {
+					reason = "configuration file does not exist"
+				} else if errors.Is(err, os.ErrPermission) {
+					reason = "permission denied reading configuration file"
+				}
+				err = &Error{File: path, Reason: reason, cause: err}
+			}
+		}
+	}()
+	decoder := l.decoders[strings.TrimPrefix(strings.ToLower(filepath.Ext(path)), ".")]
+	if decoder == nil {
+		return doc, &Error{Reason: "unsupported configuration format"}
+	}
+	info, e := os.Stat(path)
+	if e != nil {
+		return doc, e
+	}
+	if !info.Mode().IsRegular() {
+		return doc, &Error{Reason: "configuration must be a regular file"}
+	}
+	f, e := os.Open(path)
+	if e != nil {
+		return doc, e
+	}
+	defer f.Close()
+	info, e = f.Stat()
+	if e != nil {
+		return doc, e
+	}
+	if !info.Mode().IsRegular() {
+		return doc, &Error{Reason: "configuration must be a regular file"}
+	}
+	data, e := io.ReadAll(io.LimitReader(f, maxConfigBytes+1))
+	if e != nil {
+		return doc, e
+	}
+	if len(data) > maxConfigBytes {
+		return doc, &Error{Reason: "file exceeds 1 MiB"}
+	}
+	doc, err = decodeSafely(decoder, data)
+	if err != nil {
+		return doc, err
+	}
+	if _, ok := doc.Value.(map[string]any); !ok {
+		return doc, doc.diagnostic("", "root must be an object", nil)
+	}
+	return resolveDocument(doc, l.lookup)
+}
+func decodeSafely(decoder Decoder, data []byte) (doc Document, err error) {
+	defer func() {
+		if recover() != nil {
+			err = &Error{Reason: "decoder panicked"}
+		}
+	}()
+	doc, err = decoder.Decode(data)
+	if err != nil {
+		var d *Error
+		if !errors.As(err, &d) {
+			err = &Error{Reason: "invalid configuration syntax", cause: err}
+		}
+	}
+	return
+}
+
+// DecodeFile overlays a bounded document onto independent defaults. With no
+// loader argument it accepts JSON/YAML/XML. It never opens dependencies.
+func DecodeFile[T any](path string, defaults T, loaders ...*Loader) (T, error) {
+	var zero T
+	l, err := selectLoader(loaders)
+	if err != nil {
+		return zero, err
+	}
+	doc, err := l.read(path)
+	if err != nil {
+		return zero, err
+	}
+	if err := rejectEnvironmentTags(reflect.TypeOf(defaults), map[reflect.Type]bool{}); err != nil {
+		return zero, err
+	}
+	result, err := bindDocument(doc, defaults)
+	if err != nil {
+		return zero, locateError(err, path, doc)
+	}
+	return result, nil
+}
--- a/config/loader_test.go
+++ b/config/loader_test.go
@@ -0,0 +1,377 @@
+package config
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"reflect"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+type loaderExample struct {
+	Server Config `json:"server"`
+	Upload struct {
+		MaxBytes int64 `json:"maxBytes"`
+	} `json:"upload"`
+	Values   []int64 `json:"values"`
+	Optional *string `json:"optional"`
+	Enabled  bool    `json:"enabled"`
+	Dynamic  any     `json:"dynamic"`
+}
+
+func (c loaderExample) Validate() error {
+	if err := c.Server.Validate(); err != nil {
+		return AtField("server", err)
+	}
+	if c.Upload.MaxBytes < 0 {
+		return Invalid("upload.maxBytes", "must be nonnegative")
+	}
+	return nil
+}
+func noEnvironment(string) (string, bool) { return "", false }
+func configFile(t *testing.T, ext, raw string) string {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "service."+ext)
+	if err := os.WriteFile(path, []byte(raw), 0600); err != nil {
+		t.Fatal(err)
+	}
+	return path
+}
+
+func TestUnifiedFormatAndPrecedence(t *testing.T) {
+	formats := map[string]string{
+		"json": `{"server":{"http":{"readTimeout":"2s"}},"upload":{"maxBytes":"${APP_UPLOAD_MAX_BYTES}"},"values":[9007199254740993],"optional":null,"enabled":"${APP_ENABLED}","dynamic":{"id":9007199254740993}}`,
+		"yaml": "server:\n  http:\n    readTimeout: 2s\nupload:\n  maxBytes: \"${APP_UPLOAD_MAX_BYTES}\"\nvalues: [9007199254740993]\noptional: null\nenabled: \"${APP_ENABLED}\"\ndynamic:\n  id: 9007199254740993\n",
+		"xml":  `<config><server><http><readTimeout>2s</readTimeout></http></server><upload><maxBytes>${APP_UPLOAD_MAX_BYTES}</maxBytes></upload><values type="array"><item>9007199254740993</item></values><optional type="null"/><enabled>${APP_ENABLED}</enabled><dynamic><id type="number">9007199254740993</id></dynamic></config>`,
+	}
+	var reference loaderExample
+	for _, ext := range []string{"json", "yaml", "xml"} {
+		t.Run(ext, func(t *testing.T) {
+			old := "old"
+			base := loaderExample{Server: Default(), Optional: &old}
+			cfg, err := LoadProject(configFile(t, ext, formats[ext]), base, testLoader(func(key string) (string, bool) {
+				v, ok := map[string]string{"APP_UPLOAD_MAX_BYTES": "0", "APP_ENABLED": "false"}[key]
+				return v, ok
+			}))
+			if err != nil {
+				t.Fatal(err)
+			}
+			if cfg.Upload.MaxBytes != 0 || cfg.Enabled || cfg.Optional != nil || cfg.Values[0] != 9007199254740993 || cfg.Server.HTTP.ReadTimeout != 2*time.Second {
+				t.Fatal("values changed", cfg)
+			}
+			if cfg.Dynamic.(map[string]any)["id"] != json.Number("9007199254740993") {
+				t.Fatal("dynamic integer precision lost")
+			}
+			if ext == "json" {
+				reference = cfg
+			} else if !reflect.DeepEqual(reference, cfg) {
+				t.Fatal("format-dependent semantics")
+			}
+			if base.Optional == nil || *base.Optional != "old" {
+				t.Fatal("defaults mutated")
+			}
+		})
+	}
+	cfg, err := LoadProject("", loaderExample{Server: Default()}, testLoader(noEnvironment))
+	if err != nil || cfg.Upload.MaxBytes != 0 {
+		t.Fatal(cfg, err)
+	}
+}
+
+func TestConfigDiagnosticsAndCauses(t *testing.T) {
+	for _, tc := range []struct {
+		ext, body, field string
+		line             bool
+	}{
+		{"json", "{\n\"upload\": {\"maxBytes\":\"private-value\"}}", "upload.maxBytes", true},
+		{"yaml", "server:\n  http:\n    readTimeout: private-value", "server.http.readTimeout", true},
+		{"xml", "<config>\n<upload><maxBytes>private-value</maxBytes></upload></config>", "upload.maxBytes", true},
+		{"json", `{"upload":{"maxBytes":-1}}`, "upload.maxBytes", true},
+		{"yaml", "server:\n  http:\n    readTimeout: -1s", "server.http.readTimeout", true},
+		{"json", `{"upload":{"typo":3}}`, "upload.typo", true},
+	} {
+		t.Run(tc.ext+tc.field, func(t *testing.T) {
+			path := configFile(t, tc.ext, tc.body)
+			_, err := LoadProject(path, loaderExample{Server: Default()}, testLoader(noEnvironment))
+			var d *Error
+			if !errors.As(err, &d) || d.File != path || d.Field != tc.field || d.Reason == "" || tc.line && d.Line < 1 {
+				t.Fatalf("missing location: %#v %v", d, err)
+			}
+			if strings.Contains(err.Error(), "private-value") {
+				t.Fatal("secret leaked", err)
+			}
+		})
+	}
+	path := filepath.Join(t.TempDir(), "missing.json")
+	_, err := LoadProject(path, loaderExample{})
+	if !errors.Is(err, os.ErrNotExist) {
+		t.Fatal("I/O cause discarded", err)
+	}
+	_, err = DecodeFile(configFile(t, "json", `{"count":"private-value"}`), struct {
+		Count int `json:"count"`
+	}{})
+	var typed *json.UnmarshalTypeError
+	if !errors.As(err, &typed) {
+		t.Fatal("type cause discarded", err)
+	}
+	_, err = LoadProject(configFile(t, "yaml", "upload:\n  maxBytes: \"${APP_UPLOAD_MAX_BYTES}\""), loaderExample{Server: Default()}, testLoader(func(k string) (string, bool) { return "-1", k == "APP_UPLOAD_MAX_BYTES" }))
+	var d *Error
+	if !errors.As(err, &d) || d.Env != "APP_UPLOAD_MAX_BYTES" || d.Field != "upload.maxBytes" || d.File == "" || d.Line != 2 {
+		t.Fatal("missing file and variable provenance", err)
+	}
+
+}
+
+func TestMalformedFormatsAndLimits(t *testing.T) {
+	for ext, bodies := range map[string][]string{
+		"json": {`{"enabled":true,"enabled":false}`, `{} {}`, `{"upload":`, `{"enabled":true,"Enabled":false}`, strings.Repeat(`{"a":`, 70) + `0` + strings.Repeat(`}`, 70)},
+		"yaml": {"enabled: true\nenabled: false", "---\n{}\n---\n{}", "a: &x [1]\nb: *x", "a:\n  <<: {}", "upload: [\n"},
+		"xml":  {`<!DOCTYPE config><config/>`, `<config>&private-value;</config>`, `<config/><config/>`, `<config xmlns="x"/>`, `<config type="" type=""/>`, `<config><enabled>true</enabled><enabled>false</enabled></config>`, `<config>text<enabled>true</enabled></config>`, `<config><values type="array"><bad>1</bad></values></config>`},
+	} {
+		for i, raw := range bodies {
+			t.Run(fmt.Sprintf("%s%d", ext, i), func(t *testing.T) {
+				_, err := LoadProject(configFile(t, ext, raw), loaderExample{Server: Default()}, testLoader(noEnvironment))
+				if err == nil || strings.Contains(err.Error(), "private-value") {
+					t.Fatal(err)
+				}
+			})
+		}
+	}
+	if _, err := DecodeFile(configFile(t, "json", strings.Repeat(" ", maxConfigBytes+1)), loaderExample{}); err == nil {
+		t.Fatal("unbounded file")
+	}
+	if _, err := DecodeFile(configFile(t, "json", string([]byte{'{', '"', 0xff, '"', ':', '0', '}'})), loaderExample{}); err == nil {
+		t.Fatal("invalid UTF-8")
+	}
+}
+
+func TestDecoderRegistryAndConcurrentUse(t *testing.T) {
+	decoder := DecoderFunc(func([]byte) (Document, error) {
+		return Document{Value: map[string]any{"upload": map[string]any{"maxBytes": json.Number("42")}}}, nil
+	})
+	l, err := NewLoader(WithDecoder("custom", decoder))
+	if err != nil {
+		t.Fatal(err)
+	}
+	path := configFile(t, "custom", "ignored")
+	var wg sync.WaitGroup
+	for i := 0; i < 24; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			cfg, e := LoadProject(path, loaderExample{Server: Default()}, l)
+			if e != nil || cfg.Upload.MaxBytes != 42 {
+				t.Error(e)
+			}
+		}()
+	}
+	wg.Wait()
+	if _, err := DecodeFile(path, loaderExample{}); err == nil {
+		t.Fatal("decoder registration leaked globally")
+	}
+	for _, options := range [][]LoaderOption{{WithDecoder("json", decoder)}, {WithDecoder("x", decoder), WithDecoder("x", decoder)}, {WithDecoder("x", DecoderFunc(nil))}} {
+		if _, err = NewLoader(options...); err == nil {
+			t.Fatal("invalid registration")
+		}
+	}
+	l, _ = NewLoader(WithDecoder("panic", DecoderFunc(func([]byte) (Document, error) { panic("private-value") })))
+	_, err = DecodeFile(configFile(t, "panic", ""), loaderExample{}, l)
+	if err == nil || strings.Contains(err.Error(), "private-value") {
+		t.Fatal(err)
+	}
+	cycle := map[string]any{}
+	cycle["self"] = cycle
+	l, _ = NewLoader(WithDecoder("cycle", DecoderFunc(func([]byte) (Document, error) { return Document{Value: map[string]any{"dynamic": cycle}}, nil })))
+	if _, err = DecodeFile(configFile(t, "cycle", ""), loaderExample{}, l); err == nil {
+		t.Fatal("decoder bypassed traversal limit")
+	}
+}
+
+func FuzzConfigurationDecoders(f *testing.F) {
+	f.Add(uint8(0), []byte(`{"count":1}`))
+	f.Add(uint8(1), []byte("count: 1"))
+	f.Add(uint8(2), []byte("<config><count>1</count></config>"))
+	f.Fuzz(func(t *testing.T, format uint8, data []byte) {
+		if len(data) > 8192 {
+			data = data[:8192]
+		}
+		ds := []Decoder{JSONDecoder{}, YAMLDecoder{}, XMLDecoder{}}
+		doc, err := ds[int(format)%len(ds)].Decode(data)
+		if err == nil {
+			_, _ = bindDocument(doc, struct {
+				Count int `json:"count"`
+			}{})
+		}
+	})
+}
+
+func BenchmarkConfiguration(b *testing.B) {
+	for name, tc := range map[string]struct {
+		d   Decoder
+		raw string
+	}{"json": {JSONDecoder{}, `{"count":9007199254740993,"timeout":"5s","values":[1,2,3]}`}, "yaml": {YAMLDecoder{}, "count: 9007199254740993\ntimeout: 5s\nvalues: [1,2,3]"}, "xml": {XMLDecoder{}, `<config><count>9007199254740993</count><timeout>5s</timeout><values type="array"><item>1</item><item>2</item><item>3</item></values></config>`}} {
+		b.Run(name, func(b *testing.B) {
+			b.ReportAllocs()
+			raw := []byte(tc.raw)
+			for i := 0; i < b.N; i++ {
+				doc, err := tc.d.Decode(raw)
+				if err != nil {
+					b.Fatal(err)
+				}
+				_, err = bindDocument(doc, struct {
+					Count   int64         `json:"count"`
+					Timeout time.Duration `json:"timeout"`
+					Values  []int         `json:"values"`
+				}{})
+				if err != nil {
+					b.Fatal(err)
+				}
+			}
+		})
+	}
+}
+
+// Text-only scalars and embedded config fields use the same behavior in each format.
+type testText struct{ Value string }
+
+func (v *testText) UnmarshalText(data []byte) error { v.Value = string(data); return nil }
+func TestConfigScalarAndEmbedding(t *testing.T) {
+	type Fields struct {
+		Name string `json:"name"`
+	}
+	type C struct {
+		Fields
+		Nested Fields   `json:"nested"`
+		Scalar testText `json:"scalar"`
+		Bytes  []byte   `json:"bytes"`
+	}
+	cases := map[string]string{
+		"json": `{"name":"outer","nested":{"name":"inner"},"scalar":"text","bytes":"aGk="}`,
+		"yaml": "name: outer\nnested:\n  name: inner\nscalar: text\nbytes: aGk=\n",
+		"xml":  `<config><name>outer</name><nested><name>inner</name></nested><scalar>text</scalar><bytes>aGk=</bytes></config>`,
+	}
+	for ext, data := range cases {
+		t.Run(ext, func(t *testing.T) {
+			path := filepath.Join(t.TempDir(), "config."+ext)
+			os.WriteFile(path, []byte(data), 0600)
+			got, err := DecodeFile(path, &C{})
+			if err != nil {
+				t.Fatal(err)
+			}
+			if got.Name != "outer" || got.Nested.Name != "inner" || got.Scalar.Value != "text" || string(got.Bytes) != "hi" {
+				t.Fatal(got)
+			}
+		})
+	}
+	type Tagged struct {
+		Fields `json:"nested"`
+	}
+	doc, _ := (JSONDecoder{}).Decode([]byte(`{"name":"wrong"}`))
+	if _, err := bindDocument(doc, Tagged{}); err == nil {
+		t.Fatal("tagged embed incorrectly flattened")
+	}
+}
+func TestConfigDefaultsIsolationAndEmptyValues(t *testing.T) {
+	type Child struct {
+		Name string `json:"name"`
+	}
+	type C struct {
+		Child   *Child            `json:"child"`
+		Items   []int             `json:"items"`
+		Labels  map[string]string `json:"labels"`
+		Enabled bool              `json:"enabled"`
+	}
+	base := C{Child: &Child{Name: "old"}, Items: []int{1}, Labels: map[string]string{"old": "yes"}, Enabled: true}
+	doc, _ := (JSONDecoder{}).Decode([]byte(`{"child":{"name":"new"},"labels":{"new":"yes"},"items":[],"enabled":false}`))
+	got, err := bindDocument(doc, base)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.Child.Name != "new" || got.Items == nil || len(got.Items) != 0 || got.Enabled {
+		t.Fatal(got)
+	}
+	if base.Child.Name != "old" || len(base.Items) != 1 || len(base.Labels) != 1 {
+		t.Fatal("mutated defaults")
+	}
+	bad, _ := (JSONDecoder{}).Decode([]byte(`{"child":{"name":"changed"},"items":"bad"}`))
+	if _, err := bindDocument(bad, base); err == nil {
+		t.Fatal("invalid input accepted")
+	}
+	if base.Child.Name != "old" {
+		t.Fatal("failed load changed default pointer")
+	}
+	null, _ := (JSONDecoder{}).Decode([]byte(`{"child":null,"items":null,"labels":null,"enabled":null}`))
+	got, err = bindDocument(null, base)
+	if err != nil || got.Child != nil || got.Items != nil || got.Labels != nil || !got.Enabled {
+		t.Fatal(got, err)
+	}
+}
+func TestDefaultStageDoesNotReadEnvironment(t *testing.T) {
+	reads := 0
+	type C struct {
+		Value int `json:"value"`
+	}
+	got, err := LoadProject("", C{Value: 3}, testLoader(func(string) (string, bool) { reads++; return "9", true }))
+	if err != nil || got.Value != 3 || reads != 0 {
+		t.Fatal(got, err, reads)
+	}
+}
+
+func testLoader(lookup func(string) (string, bool)) *Loader {
+	l, err := NewLoader(WithLookupEnv(lookup))
+	if err != nil {
+		panic(err)
+	}
+	return l
+}
+func TestDecoderRegistryFrozen(t *testing.T) {
+	l, err := NewLoader()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err = WithDecoder("extra", JSONDecoder{})(l); err == nil {
+		t.Fatal("mutable registry")
+	}
+}
+func BenchmarkConfigurationStartup(b *testing.B) {
+	path := filepath.Join(b.TempDir(), "app.json")
+	if err := os.WriteFile(path, []byte(`{"server":{"http":{"readTimeout":"2s"}},"upload":{"maxBytes":4096}}`), 0600); err != nil {
+		b.Fatal(err)
+	}
+
+	defaults := loaderExample{Server: Default()}
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if _, err := LoadProject(path, defaults); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+func BenchmarkConfigurationLarge(b *testing.B) {
+	type Entry struct {
+		Timeout time.Duration `json:"timeout"`
+		Count   int           `json:"count"`
+	}
+	type Large struct {
+		Entries []Entry `json:"entries"`
+	}
+	raw := []byte(`{"entries":[` + strings.TrimSuffix(strings.Repeat(`{"timeout":"3s","count":10},`, 1000), ",") + `]}`)
+	b.SetBytes(int64(len(raw)))
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		doc, err := (JSONDecoder{}).Decode(raw)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if _, err = bindDocument(doc, Large{}); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
--- a/config/moduleDiagnostics_test.go
+++ b/config/moduleDiagnostics_test.go
@@ -0,0 +1,85 @@
+package config_test
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"git.yuntuo.hk/k2safe/go-omni/config"
+	mysql "git.yuntuo.hk/k2safe/go-omni/database/mysql"
+	"git.yuntuo.hk/k2safe/go-omni/httpc"
+)
+
+type moduleConfig struct {
+	Database mysql.Config  `json:"database"`
+	Server   config.Config `json:"server"`
+	Client   httpc.Config  `json:"client"`
+}
+
+func (c moduleConfig) Validate() error {
+	if err := c.Database.Validate(); err != nil {
+		return config.AtField("database", err)
+	}
+	if err := c.Server.Validate(); err != nil {
+		return config.AtField("server", err)
+	}
+	return config.AtField("client", c.Client.Validate())
+}
+func TestModuleFieldDiagnostics(t *testing.T) {
+	for _, tc := range []struct{ name, source, field, reason string }{
+		{"port", "database:\n  port: 70000\n", "database.port", "1 and 65535"},
+		{"host", "database:\n  host: 'invalid host'\n", "database.host", "hostname"},
+		{"pool", "database:\n  pool:\n    maxIdleConns: 999\n", "database.pool.maxIdleConns", "maxOpenConns"},
+		{"ping", "database:\n  pool:\n    pingTimeout: 0s\n", "database.pool.pingTimeout", "positive"},
+		{"timeout", "database:\n  readTimeout: -1s\n", "database.readTimeout", "nonnegative"},
+		{"mysqlZone", "database:\n  location: Secret/Not_A_Zone\n", "database.location", "IANA"},
+		{"tlsPair", "database:\n  tls:\n    certFile: secret-file\n    keyFile: ''\n", "database.tls.keyFile", "certFile"},
+		{"level", "server:\n  log:\n    level: secret-level\n", "server.log.level", "debug"},
+		{"format", "server:\n  log:\n    format: secret-format\n", "server.log.format", "json or text"},
+		{"rotation", "server:\n  log:\n    rotation:\n      maxBackups: -1\n", "server.log.rotation.maxBackups", "10000"},
+		{"zone", "server:\n  log:\n    timeZone: Secret/Not_A_Zone\n", "server.log.timeZone", "IANA"},
+		{"lifecycle", "server:\n  lifecycle:\n    stopTimeout: -1s\n", "server.lifecycle.stopTimeout", "nonnegative"},
+		{"policy", "server:\n  request:\n    body: secret-mode\n", "server.request.body", "required"},
+		{"clientPool", "client:\n  maxIdleConns: -1\n", "client.maxIdleConns", "131072"},
+		{"proxy", "client:\n  proxy:\n    mode: url\n    url: 'https://private:secret@localhost/path'\n", "client.proxy.url", "origin"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			path := filepath.Join(t.TempDir(), "config.yaml")
+			if err := os.WriteFile(path, []byte(tc.source), 0600); err != nil {
+				t.Fatal(err)
+			}
+			_, err := config.LoadProject(path, moduleConfig{Database: mysql.DefaultConfig(), Server: config.Default()})
+			var d *config.Error
+			if !errors.As(err, &d) || d.Field != tc.field || d.File != path || d.Line <= 1 || d.Column <= 0 || !strings.Contains(d.Reason, tc.reason) {
+				t.Fatalf("diagnostic: %v", err)
+			}
+			if strings.Contains(err.Error(), "secret") || strings.Contains(err.Error(), "Secret/") || strings.Contains(err.Error(), "private") {
+				t.Fatalf("value leaked: %v", err)
+			}
+		})
+	}
+}
+func TestModuleDiagnosticsKeepReferenceAndCause(t *testing.T) {
+	t.Setenv("CHECK_PORT", "70000")
+	path := filepath.Join(t.TempDir(), "config.yaml")
+	os.WriteFile(path, []byte("database:\n  port: '${CHECK_PORT}'\n"), 0600)
+	_, err := config.LoadProject(path, moduleConfig{Database: mysql.DefaultConfig(), Server: config.Default()})
+	var d *config.Error
+	if !errors.As(err, &d) || d.Field != "database.port" || d.Env != "CHECK_PORT" || d.Line != 2 {
+		t.Fatal(err)
+	}
+	original := mysql.DefaultConfig()
+	original.Port = 70000
+	cause := original.Validate()
+	wrapped := config.AtField("database", cause)
+	if !errors.Is(wrapped, cause) {
+		t.Fatal("lost original validation error")
+	}
+	// Unknown project errors continue to be redacted rather than echoed.
+	wrapped = config.AtField("custom", errors.New("private-password"))
+	if strings.Contains(wrapped.Error(), "private-password") {
+		t.Fatal(wrapped)
+	}
+}
--- a/config/project.go
+++ b/config/project.go
@@ -1,221 +1,105 @@
 package config

 import (
-	"bytes"
 	"encoding"
-	"encoding/json"
 	"errors"
-	"fmt"
-	apierrors "git.yuntuo.hk/k2safe/go-omni/errors"
 	"math"
-	"os"
 	"reflect"
 	"strconv"
 	"strings"
 	"time"
-	"unicode"
 )

-// EnvOptions controls typed project configuration overlays. Explicit env tags
-// are absolute names; otherwise JSON names become PREFIX_NESTED_FIELD names.
-// Empty is allow (default), ignore or reject. No input values appear in errors.
-type EnvOptions struct {
-	Prefix string
-	Empty  string
-	Lookup func(string) (string, bool)
-	// Aliases maps canonical absolute environment names to ordered fallback names.
-	// A present canonical value wins, including an explicit empty value.
-	Aliases map[string][]string
-}
-
-// ApplyDefaults applies envDefault tags to zero fields before file overlays.
-func ApplyDefaults[T any](base T) (T, error) { return projectOverlay(base, EnvOptions{}, true) }
-
-// LoadProject applies code/tag defaults, a strict optional file, environment,
-// then the project's Validate method, before any logger or dependency is opened.
-// envDefault is only applied to zero-valued defaults before reading the file.
-func LoadProject[T any](path string, defaults T, options EnvOptions) (T, error) {
+// LoadProject clones defaults, resolves only explicit file references, binds the
+// provided fields and validates. Empty path uses only defaults. No env tags,
+// prefixes, aliases or implicit environment overlays are applied.
+func LoadProject[T any](path string, defaults T, loaders ...*Loader) (T, error) {
 	var zero T
-	cfg, err := projectOverlay(defaults, options, true)
+	loader, err := selectLoader(loaders)
 	if err != nil {
 		return zero, err
 	}
+	if err = rejectEnvironmentTags(reflect.TypeOf(defaults), map[reflect.Type]bool{}); err != nil {
+		return zero, err
+	}
+	doc := Document{Value: map[string]any{}}
 	if path != "" {
-		cfg, err = DecodeFile(path, cfg)
+		doc, err = loader.read(path)
 		if err != nil {
-			return zero, errors.New("config: cannot decode file; check its path, format, field names and value types")
+			return zero, err
 		}
 	}
-	cfg, err = OverlayEnv(cfg, options)
+	cfg, err := bindDocument(doc, defaults)
 	if err != nil {
-		return zero, err
+		return zero, locateError(err, path, doc)
 	}
 	if valid, ok := any(&cfg).(interface{ Validate() error }); ok {
 		if err = valid.Validate(); err != nil {
-			return zero, err
+			return zero, locateError(err, path, doc)
+		}
+	} else if valid, ok := any(cfg).(interface{ Validate() error }); ok {
+		if err = valid.Validate(); err != nil {
+			return zero, locateError(err, path, doc)
 		}
 	}
 	return cfg, nil
 }
+func locateError(err error, path string, doc Document) *Error {
+	d := validationError(err)
+	d.File = path
+	if d.Line == 0 {
+		p := doc.Positions[d.Field]
+		d.Line = p.Line
+		d.Column = p.Column
+	}
+	for field := d.Field; field != ""; {
+		if names := doc.environments[field]; len(names) > 0 {
+			d.Env = strings.Join(names, ", ")
+			break
+		}
+		i := strings.LastIndexAny(field, ".[")
+		if i < 0 {
+			break
+		}
+		field = field[:i]
+	}
+	return d
+}

-// OverlayEnv overlays the entire project struct without mutating the input.
-// Tags: env:"CUSTOM_NAME,required,secret,empty=reject"; env:"-" excludes a
-// subtree. required means nonempty string/non-nil pointer or collection; false
-// and zero are valid scalars. Use project Validate for semantic constraints.
-// Slices/maps use JSON syntax, avoiding ambiguous comma and empty semantics.
-func OverlayEnv[T any](base T, options EnvOptions) (T, error) {
-	return projectOverlay(base, options, false)
+// Reject removed declarations rather than silently ignoring deployment rules.
+func rejectEnvironmentTags(t reflect.Type, seen map[reflect.Type]bool) error {
+	if t == nil || seen[t] {
+		return nil
+	}
+	seen[t] = true
+	switch t.Kind() {
+	case reflect.Pointer, reflect.Slice, reflect.Array, reflect.Map:
+		return rejectEnvironmentTags(t.Elem(), seen)
+	case reflect.Struct:
+		for i := 0; i < t.NumField(); i++ {
+			f := t.Field(i)
+			if f.PkgPath != "" {
+				continue
+			}
+			_, env := f.Tag.Lookup("env")
+			_, def := f.Tag.Lookup("envDefault")
+			if env || def {
+				return &Error{Field: f.Name, Reason: "env/envDefault tags were removed; use Default() and explicit file references; see CONFIG.md"}
+			}
+			if f.Tag.Get("json") != "-" {
+				if err := rejectEnvironmentTags(f.Type, seen); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
 }

 var textType = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem()
 var durationType = reflect.TypeOf(time.Duration(0))

-func projectOverlay[T any](base T, options EnvOptions, defaults bool) (T, error) {
-	var zero T
-	if options.Lookup == nil {
-		options.Lookup = os.LookupEnv
-	}
-	if options.Empty == "" {
-		options.Empty = "allow"
-	}
-	if options.Empty != "allow" && options.Empty != "ignore" && options.Empty != "reject" {
-		return zero, errors.New("config: empty policy must be allow, ignore or reject")
-	}
-	v := reflect.ValueOf(&base).Elem()
-	if v.Kind() != reflect.Struct {
-		return zero, errors.New("config: project configuration must be a struct")
-	}
-	result := reflect.New(v.Type()).Elem()
-	result.Set(v)
-	seen := map[string]bool{}
-	var walk func(reflect.Value, string, int) error
-	walk = func(value reflect.Value, prefix string, depth int) error {
-		if depth > 32 {
-			return errors.New("config: nesting exceeds 32")
-		}
-		for i := 0; i < value.NumField(); i++ {
-			field := value.Type().Field(i)
-			dst := value.Field(i)
-			if !dst.CanSet() || field.PkgPath != "" {
-				continue
-			}
-			tag := strings.Split(field.Tag.Get("env"), ",")
-			if tag[0] == "-" {
-				continue
-			}
-			jsonName := strings.Split(field.Tag.Get("json"), ",")[0]
-			if jsonName == "-" && tag[0] == "" {
-				continue
-			}
-			if jsonName == "" {
-				jsonName = field.Name
-			}
-			key := prefix + envName(jsonName)
-			if tag[0] != "" {
-				key = tag[0]
-			}
-			empty, required := options.Empty, false
-			for _, opt := range tag[1:] {
-				switch opt {
-				case "required":
-					required = true
-				case "secret", "":
-				case "empty=allow":
-					empty = "allow"
-				case "empty=ignore":
-					empty = "ignore"
-				case "empty=reject":
-					empty = "reject"
-				default:
-					return fmt.Errorf("config: invalid env tag for %s", key)
-				}
-			}
-			if dst.Kind() == reflect.Struct && !dst.Addr().Type().Implements(textType) {
-				if err := walk(dst, key+"_", depth+1); err != nil {
-					return err
-				}
-				continue
-			}
-			if dst.Kind() == reflect.Pointer && dst.Type().Elem().Kind() == reflect.Struct && !dst.Type().Implements(textType) {
-				// Clone before traversing so a failed overlay never edits defaults.
-				child := reflect.New(dst.Type().Elem())
-				if !dst.IsNil() {
-					child.Elem().Set(dst.Elem())
-				}
-				if err := walk(child.Elem(), key+"_", depth+1); err != nil {
-					return err
-				}
-				if !dst.IsNil() || !child.Elem().IsZero() {
-					dst.Set(child)
-				}
-				if required && !defaults && dst.IsNil() {
-					return fmt.Errorf("config: %s is required", key)
-				}
-				continue
-			}
-			// Unexported runtime capabilities are skipped unless explicitly tagged.
-			if dst.Kind() == reflect.Func || dst.Kind() == reflect.Chan || dst.Kind() == reflect.Interface {
-				if tag[0] != "" {
-					return fmt.Errorf("config: %s has unsupported environment type", key)
-				}
-				continue
-			}
-			if seen[key] {
-				return fmt.Errorf("config: duplicate environment key %s", key)
-			}
-			seen[key] = true
-			raw, present := options.Lookup(key)
-			selectedKey := key
-			if !present && !defaults {
-				for _, alias := range options.Aliases[key] {
-					if raw, present = options.Lookup(alias); present {
-						selectedKey = alias
-						break
-					}
-				}
-			}
-			if defaults {
-				raw, present = field.Tag.Lookup("envDefault")
-				present = present && dst.IsZero()
-			}
-			if present && raw == "" && !defaults {
-				if empty == "reject" {
-					return fmt.Errorf("config: %s must not be empty", selectedKey)
-				}
-				if empty == "ignore" {
-					present = false
-				}
-			}
-			if present {
-				parsed := reflect.New(dst.Type()).Elem()
-				if err := parseEnvValue(parsed, raw); err != nil {
-					return fmt.Errorf("config: %s must be a valid %s", selectedKey, dst.Type())
-				}
-				dst.Set(parsed)
-			}
-			if required && !defaults && emptyRequired(dst) {
-				return fmt.Errorf("config: %s is required", key)
-			}
-		}
-		return nil
-	}
-	if err := walk(result, options.Prefix, 0); err != nil {
-		return zero, err
-	}
-	return result.Interface().(T), nil
-}
-
-func emptyRequired(v reflect.Value) bool {
-	switch v.Kind() {
-	case reflect.String:
-		return v.Len() == 0
-	case reflect.Pointer, reflect.Map, reflect.Slice:
-		return v.IsNil()
-	}
-	return false
-}
-
-func parseEnvValue(v reflect.Value, raw string) (err error) {
+func parseTextValue(v reflect.Value, raw string) (err error) {
 	defer func() {
 		if recover() != nil {
 			err = errors.New("invalid custom value")
@@ -223,7 +107,7 @@ func parseEnvValue(v reflect.Value, raw string) (err error) {
 	}()
 	if v.Kind() == reflect.Pointer {
 		v.Set(reflect.New(v.Type().Elem()))
-		return parseEnvValue(v.Elem(), raw)
+		return parseTextValue(v.Elem(), raw)
 	}
 	if v.CanAddr() && v.Addr().Type().Implements(textType) {
 		return v.Addr().Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(raw))
@@ -266,37 +150,6 @@ func parseEnvValue(v reflect.Value, raw string) (err error) {
 			v.SetFloat(x)
 		}
 		return err
-	case reflect.Slice, reflect.Map:
-		var value any
-		if err := apierrors.DecodeCatalogJSON([]byte(raw), &value); err != nil {
-			return err
-		}
-		value, err := durations(value, v.Type())
-		if err != nil {
-			return err
-		}
-		encoded, err := json.Marshal(value)
-		if err != nil {
-			return err
-		}
-		decoder := json.NewDecoder(bytes.NewReader(encoded))
-		decoder.DisallowUnknownFields()
-		return decoder.Decode(v.Addr().Interface())
 	}
-	return errors.New("unsupported environment value")
-}
-
-func envName(s string) string {
-	r := []rune(s)
-	var out strings.Builder
-	for i, c := range r {
-		if i > 0 && unicode.IsUpper(c) && (unicode.IsLower(r[i-1]) || unicode.IsDigit(r[i-1]) || (i+1 < len(r) && unicode.IsLower(r[i+1]))) {
-			out.WriteByte('_')
-		}
-		if c == '-' {
-			c = '_'
-		}
-		out.WriteRune(unicode.ToUpper(c))
-	}
-	return out.String()
+	return errors.New("expected scalar text")
 }
--- a/config/projectAdvanced_test.go
+++ b/config/projectAdvanced_test.go
@@ -42,20 +42,3 @@ func TestConfigFilePreservesDefaultsWithoutSharingMutableData(t *testing.T) {
 		t.Fatal("decode error leaked contents", err)
 	}
 }
-func TestEnvCollectionPrecisionAndDurationMaps(t *testing.T) {
-	type cfg struct {
-		IDs    []int64                  `json:"ids"`
-		Timers map[string]time.Duration `json:"timers"`
-	}
-	lookup := func(key string) (string, bool) {
-		v, ok := map[string]string{"IDS": "[9007199254740993]", "TIMERS": `{"backoff":"250ms"}`}[key]
-		return v, ok
-	}
-	c, err := OverlayEnv(cfg{}, EnvOptions{Lookup: lookup})
-	if err != nil || c.IDs[0] != 9007199254740993 || c.Timers["backoff"] != 250*time.Millisecond {
-		t.Fatal(c, err)
-	}
-	if _, err = OverlayEnv(cfg{}, EnvOptions{Lookup: func(key string) (string, bool) { return `{"x":"1s","x":"2s"}`, key == "TIMERS" }}); err == nil {
-		t.Fatal("duplicate map key accepted")
-	}
-}
--- a/config/project_test.go
+++ b/config/project_test.go
@@ -1,124 +0,0 @@
-package config
-
-import (
-	"errors"
-	"os"
-	"path/filepath"
-	"reflect"
-	"strings"
-	"testing"
-	"time"
-)
-
-type projectNested struct {
-	ReadTimeout time.Duration `json:"readTimeout"`
-	Names       []string      `json:"names"`
-}
-type projectConfig struct {
-	Nested   *projectNested `json:"nested"`
-	Enabled  bool           `json:"enabled"`
-	Count    int            `json:"count" envDefault:"12"`
-	Password string         `json:"-" env:"ETAX_PASSWORD,secret,required,empty=reject"`
-	Label    string         `json:"label" env:",empty=ignore"`
-}
-
-func (c projectConfig) Validate() error {
-	if c.Count < 0 {
-		return errors.New("count must be nonnegative")
-	}
-	return nil
-}
-func TestProjectConfigurationOrderAndValues(t *testing.T) {
-	f := filepath.Join(t.TempDir(), "config.yaml")
-	if err := os.WriteFile(f, []byte("count: 3\nenabled: true\nnested:\n  readTimeout: 2s\n  names: [file]\nlabel: keep\n"), 0600); err != nil {
-		t.Fatal(err)
-	}
-	env := map[string]string{"ETAX_PASSWORD": "  password  ", "APP_ENABLED": "false", "APP_COUNT": "0", "APP_NESTED_READ_TIMEOUT": "7s", "APP_NESTED_NAMES": "[]", "APP_LABEL": ""}
-	options := EnvOptions{Prefix: "APP_", Lookup: func(k string) (string, bool) { v, ok := env[k]; return v, ok }}
-	cfg, err := LoadProject(f, projectConfig{}, options)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if cfg.Enabled || cfg.Count != 0 || cfg.Password != "  password  " || cfg.Nested.ReadTimeout != 7*time.Second || cfg.Nested.Names == nil || len(cfg.Nested.Names) != 0 || cfg.Label != "keep" {
-		t.Fatal("overlay mismatch")
-	}
-	delete(env, "APP_COUNT")
-	cfg, err = LoadProject("", projectConfig{}, options)
-	if err != nil || cfg.Count != 12 {
-		t.Fatal(cfg.Count, err)
-	}
-	env["APP_COUNT"] = "-1"
-	if _, err = LoadProject(f, projectConfig{}, options); err == nil {
-		t.Fatal("project Validate not called")
-	}
-}
-
-func TestProjectOverlayIsTransactionalAndRedacted(t *testing.T) {
-	base := projectConfig{Nested: &projectNested{ReadTimeout: time.Second, Names: []string{"old"}}, Password: "original"}
-	env := map[string]string{"APP_NESTED_READ_TIMEOUT": "2s", "APP_NESTED_NAMES": "[\"new\"]", "APP_COUNT": "secret-value"}
-	_, err := OverlayEnv(base, EnvOptions{Prefix: "APP_", Lookup: func(k string) (string, bool) { v, ok := env[k]; return v, ok }})
-	if err == nil || strings.Contains(err.Error(), "secret-value") {
-		t.Fatal(err)
-	}
-	if base.Nested.ReadTimeout != time.Second || !reflect.DeepEqual(base.Nested.Names, []string{"old"}) {
-		t.Fatal("default pointer modified")
-	}
-	delete(env, "APP_COUNT")
-	env["ETAX_PASSWORD"] = ""
-	if _, err = OverlayEnv(base, EnvOptions{Prefix: "APP_", Lookup: func(k string) (string, bool) { v, ok := env[k]; return v, ok }}); err == nil {
-		t.Fatal("empty secret accepted")
-	}
-	type required struct {
-		Token string `env:"TOKEN,required"`
-	}
-	if _, err = OverlayEnv(required{}, EnvOptions{Lookup: func(string) (string, bool) { return "", false }}); err == nil {
-		t.Fatal("required absent")
-	}
-	type duplicate struct {
-		A string `env:"SAME"`
-		B string `env:"SAME"`
-	}
-	if _, err = OverlayEnv(duplicate{}, EnvOptions{}); err == nil {
-		t.Fatal("duplicate env binding accepted")
-	}
-}
-
-func TestEnvironmentCollectionAndEmptySemantics(t *testing.T) {
-	type sample struct {
-		Values   []time.Duration
-		Flag     bool
-		Text     string
-		Optional *int
-	}
-	cases := []struct {
-		raw   string
-		valid bool
-	}{{`["1s","2s"]`, true}, {`["invalid-secret"]`, false}}
-	for _, tc := range cases {
-		cfg, err := OverlayEnv(sample{}, EnvOptions{Lookup: func(k string) (string, bool) {
-			if k == "VALUES" {
-				return tc.raw, true
-			}
-			return "", false
-		}})
-		if (err == nil) != tc.valid {
-			t.Fatal(err)
-		}
-		if tc.valid && !reflect.DeepEqual(cfg.Values, []time.Duration{time.Second, 2 * time.Second}) {
-			t.Fatal(cfg)
-		}
-		if err != nil && strings.Contains(err.Error(), "secret") {
-			t.Fatal(err)
-		}
-	}
-	for _, mode := range []string{"allow", "ignore", "reject"} {
-		cfg, err := OverlayEnv(sample{Text: "old"}, EnvOptions{Empty: mode, Lookup: func(k string) (string, bool) { return "", k == "TEXT" }})
-		if mode == "reject" {
-			if err == nil {
-				t.Fatal("empty not rejected")
-			}
-		} else if err != nil || (mode == "allow" && cfg.Text != "") || (mode == "ignore" && cfg.Text != "old") {
-			t.Fatal(cfg, err)
-		}
-	}
-}
--- a/config/references.go
+++ b/config/references.go
@@ -0,0 +1,210 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"unicode/utf8"
+)
+
+// WithLookupEnv supplies an explicit-reference lookup for tests or an embedding
+// host. Ordinary projects need no loader options. The function must support
+// concurrent loads; each load caches each referenced name independently.
+func WithLookupEnv(lookup func(string) (string, bool)) LoaderOption {
+	return func(l *Loader) error {
+		if l == nil || l.sealed || lookup == nil {
+			return errors.New("config: expected a non-nil environment lookup on a new loader")
+		}
+		l.lookup = lookup
+		return nil
+	}
+}
+
+// resolvedText is textual input bound according to the target scalar type. It
+// never becomes an object, collection or null by interpreting environment data.
+type resolvedText string
+
+const maxExpandedBytes = 4 << 20
+
+type environmentValue struct {
+	value   string
+	present bool
+}
+type referenceResolver struct {
+	lookup                   func(string) (string, bool)
+	cache                    map[string]environmentValue
+	doc                      Document
+	nodes, bytes, cacheBytes int
+}
+
+func resolveDocument(doc Document, lookup func(string) (string, bool)) (Document, error) {
+	r := referenceResolver{lookup: lookup, cache: map[string]environmentValue{}, doc: Document{Positions: doc.Positions, environments: map[string][]string{}}}
+	v, err := r.walk(doc.Value, "", 0)
+	if err != nil {
+		return Document{}, err
+	}
+	r.doc.Value = v
+	return r.doc, nil
+}
+func (r *referenceResolver) walk(v any, path string, depth int) (any, error) {
+	r.nodes++
+	if depth > maxConfigDepth || r.nodes > maxConfigNodes {
+		return nil, r.doc.diagnostic(path, "configuration nesting or node limit exceeded", nil)
+	}
+	switch x := v.(type) {
+	case string:
+		return r.text(x, path, false)
+	case Text:
+		return r.text(string(x), path, true)
+	case map[string]any:
+		out := make(map[string]any, len(x))
+		for _, key := range sortedKeys(x) {
+			value, err := r.walk(x[key], joinField(path, key), depth+1)
+			if err != nil {
+				return nil, err
+			}
+			out[key] = value
+		}
+		return out, nil
+	case []any:
+		out := make([]any, len(x))
+		for i, value := range x {
+			var err error
+			out[i], err = r.walk(value, fmt.Sprintf("%s[%d]", path, i), depth+1)
+			if err != nil {
+				return nil, err
+			}
+		}
+		return out, nil
+	default:
+		return v, nil
+	}
+}
+func (r *referenceResolver) fail(path, name, reason string) error {
+	d := r.doc.diagnostic(path, reason, nil)
+	d.Env = name
+	return d
+}
+func validEnvironmentName(name string) bool {
+	if len(name) == 0 {
+		return false
+	}
+	for i := 0; i < len(name); i++ {
+		c := name[i]
+		if c == '_' || c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z' || i > 0 && c >= '0' && c <= '9' {
+			continue
+		}
+		return false
+	}
+	return true
+}
+func (r *referenceResolver) lookupValue(name, path string) (environmentValue, error) {
+	if v, ok := r.cache[name]; ok {
+		return v, nil
+	}
+	value, present := r.lookup(name)
+	if len(value) > maxConfigBytes || r.cacheBytes+len(value) > maxExpandedBytes {
+		return environmentValue{}, r.fail(path, name, "environment value exceeds configuration size limit")
+	}
+	if !utf8.ValidString(value) {
+		return environmentValue{}, r.fail(path, name, "environment value is not valid UTF-8")
+	}
+
+	r.cacheBytes += len(value)
+	v := environmentValue{value, present}
+	r.cache[name] = v
+	return v, nil
+}
+func (r *referenceResolver) text(raw, path string, xmlText bool) (any, error) {
+	var out strings.Builder
+	var names []string
+	seen := map[string]bool{}
+	if !strings.Contains(raw, "$") {
+		if len(raw) > maxConfigBytes || r.bytes+len(raw) > maxExpandedBytes {
+			return nil, r.fail(path, "", "expanded configuration exceeds size limit")
+		}
+		r.bytes += len(raw)
+		if xmlText {
+			return Text(raw), nil
+		}
+		return raw, nil
+	}
+	appendText := func(s string) error {
+		if out.Len()+len(s) > maxConfigBytes || r.bytes+len(s) > maxExpandedBytes {
+			return r.fail(path, strings.Join(names, ", "), "expanded configuration exceeds size limit")
+		}
+		out.WriteString(s)
+		r.bytes += len(s)
+		return nil
+	}
+	// Scan only the file's decoded scalar. Inserted environment values are never
+	// scanned again, including dollars, quotes, separators or newline characters.
+	for i := 0; i < len(raw); {
+		j := strings.IndexByte(raw[i:], '$')
+		if j < 0 {
+			if err := appendText(raw[i:]); err != nil {
+				return nil, err
+			}
+			break
+		}
+		j += i
+		if err := appendText(raw[i:j]); err != nil {
+			return nil, err
+		}
+		switch {
+		case j+1 < len(raw) && raw[j+1] == '$':
+			if err := appendText("$"); err != nil {
+				return nil, err
+			}
+			i = j + 2
+		case j+1 < len(raw) && raw[j+1] == '{':
+			end := strings.IndexByte(raw[j+2:], '}')
+			if end < 0 {
+				return nil, r.fail(path, "", "unclosed environment reference; use ${NAME}, ${NAME:-fallback} or $${...} for a literal")
+			}
+			end += j + 2
+			expression := raw[j+2 : end]
+			name, fallback, hasDefault := strings.Cut(expression, ":-")
+			if !validEnvironmentName(name) || strings.Contains(fallback, "${") {
+				return nil, r.fail(path, "", "invalid environment reference; use ${NAME} or ${NAME:-fallback}; nested references are not supported")
+			}
+			r.nodes++
+			if r.nodes > maxConfigNodes {
+				return nil, r.fail(path, name, "environment reference count exceeds configuration limit")
+			}
+			if !seen[name] {
+				names = append(names, name)
+				seen[name] = true
+			}
+
+			value, err := r.lookupValue(name, path)
+			if err != nil {
+				return nil, err
+			}
+			selected := value.value
+			if !value.present || selected == "" {
+				if !hasDefault {
+					return nil, r.fail(path, name, "required environment variable is unset or empty")
+				}
+				selected = fallback
+			}
+			if err := appendText(selected); err != nil {
+				return nil, err
+			}
+			i = end + 1
+		default:
+			if err := appendText("$"); err != nil {
+				return nil, err
+			}
+			i = j + 1
+		}
+	}
+	if len(names) > 0 {
+		r.doc.environments[path] = names
+		return resolvedText(out.String()), nil
+	}
+	if xmlText {
+		return Text(out.String()), nil
+	}
+	return out.String(), nil
+}
--- a/config/references_test.go
+++ b/config/references_test.go
@@ -0,0 +1,230 @@
+package config
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+type referenceConfig struct {
+	Port      int               `json:"port"`
+	BatchSize int               `json:"batchSize"`
+	Enabled   bool              `json:"enabled"`
+	Password  string            `json:"password"`
+	Address   string            `json:"address"`
+	Timeout   time.Duration     `json:"timeout"`
+	Optional  *int              `json:"optional"`
+	Labels    map[string]string `json:"labels"`
+	Numbers   []int64           `json:"numbers"`
+	Dynamic   any               `json:"dynamic"`
+}
+
+func (c referenceConfig) Validate() error {
+	if c.Port < 0 {
+		return Invalid("port", "must not be negative")
+	}
+	return nil
+}
+func TestExplicitReferencesAcrossFormats(t *testing.T) {
+	// Delimiters, quotes and newlines belong to the credential, never file syntax.
+	secret := "  DDSFLKJlsf:saf:-123\"\n${DO_NOT_READ}&<>\\  "
+	sources := map[string]string{
+		"json": `{"port":"${PORT:-3306}","enabled":"${ENABLED:-true}","password":"${PASSWORD}","address":"https://${HOST}:${PORT:-3306}/v1","timeout":"${TIMEOUT:-3s}","optional":"${ZERO}","numbers":["${BIG}"],"dynamic":"${ZERO}","labels":{"literal":"$${NOT_READ}","empty":"${OPTIONAL:-}","dollars":"$$cost"}}`,
+		"yaml": "port: \"${PORT:-3306}\"\nenabled: \"${ENABLED:-true}\"\npassword: \"${PASSWORD}\"\naddress: \"https://${HOST}:${PORT:-3306}/v1\"\ntimeout: \"${TIMEOUT:-3s}\"\noptional: \"${ZERO}\"\nnumbers: [\"${BIG}\"]\ndynamic: \"${ZERO}\"\nlabels:\n  literal: \"$${NOT_READ}\"\n  empty: \"${OPTIONAL:-}\"\n  dollars: \"$$cost\"\n",
+		"xml":  `<config><port>${PORT:-3306}</port><enabled>${ENABLED:-true}</enabled><password>${PASSWORD}</password><address>https://${HOST}:${PORT:-3306}/v1</address><timeout>${TIMEOUT:-3s}</timeout><optional>${ZERO}</optional><numbers type="array"><item>${BIG}</item></numbers><dynamic>${ZERO}</dynamic><labels><literal>$${NOT_READ}</literal><empty>${OPTIONAL:-}</empty><dollars>$$cost</dollars></labels></config>`,
+	}
+	for ext, source := range sources {
+		t.Run(ext, func(t *testing.T) {
+			calls := map[string]int{}
+			values := map[string]string{"PORT": "0", "ENABLED": "false", "PASSWORD": secret, "HOST": "example.test", "ZERO": "0", "BIG": "9007199254740993"}
+			l := testLoader(func(name string) (string, bool) { calls[name]++; v, ok := values[name]; return v, ok })
+			got, err := LoadProject(configFile(t, ext, source), referenceConfig{Port: 77, BatchSize: 100, Enabled: true, Password: "old"}, l)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if got.Port != 0 || got.BatchSize != 100 || got.Enabled || got.Password != secret || got.Address != "https://example.test:0/v1" || got.Timeout != 3*time.Second || got.Optional == nil || *got.Optional != 0 || got.Numbers[0] != 9007199254740993 || got.Dynamic != "0" {
+				t.Fatal("binding changed values")
+			}
+			if got.Labels["literal"] != "${NOT_READ}" || got.Labels["empty"] != "" || got.Labels["dollars"] != "$cost" {
+				t.Fatal(got.Labels)
+			}
+			for name, n := range calls {
+				if n != 1 {
+					t.Fatal("not cached", name, n)
+				}
+			}
+			if calls["DO_NOT_READ"] != 0 || calls["NOT_READ"] != 0 {
+				t.Fatal("recursive expansion")
+			}
+		})
+	}
+}
+func TestReferenceFallbackAndFixedValues(t *testing.T) {
+	for _, present := range []bool{false, true} {
+		l := testLoader(func(string) (string, bool) { return "", present })
+		got, err := LoadProject(configFile(t, "yaml", "port: \"${PORT:-3306}\"\npassword: \"${PASSWORD:-DDSFLKJlsf:saf:-123}\""), referenceConfig{}, l)
+		if err != nil || got.Port != 3306 || got.Password != "DDSFLKJlsf:saf:-123" {
+			t.Fatal(got, err)
+		}
+		for _, ext := range []string{"json", "yaml", "xml"} {
+			raw := `{"password":"${PASSWORD}"}`
+			if ext == "yaml" {
+				raw = "password: '${PASSWORD}'"
+			}
+			if ext == "xml" {
+				raw = "<config><password>${PASSWORD}</password></config>"
+			}
+			path := configFile(t, ext, raw)
+			_, err = LoadProject(path, referenceConfig{Password: "initial"}, l)
+			var d *Error
+			if !errors.As(err, &d) || d.Env != "PASSWORD" || d.File != path || d.Field != "password" || d.Line < 1 {
+				t.Fatal("missing required-reference diagnostic", err)
+			}
+		}
+	}
+	calls := 0
+	l := testLoader(func(string) (string, bool) { calls++; return "999", true })
+	got, err := LoadProject(configFile(t, "json", `{"port":0,"enabled":false,"password":""}`), referenceConfig{Port: 77, BatchSize: 100, Enabled: true, Password: "old"}, l)
+	if err != nil || got.Port != 0 || got.BatchSize != 100 || got.Enabled || got.Password != "" || calls != 0 {
+		t.Fatal(got, err, calls)
+	}
+	got, err = LoadProject(configFile(t, "yaml", "password: '${VALUE}'"), referenceConfig{}, testLoader(func(string) (string, bool) { return "  ", true }))
+	if err != nil || got.Password != "  " {
+		t.Fatal("trimmed credential", err)
+	}
+}
+func TestReferenceDiagnosticsAndScalarLimits(t *testing.T) {
+	for _, value := range []string{"private-not-int", "92233720368547758080", "false", "null", "-1"} {
+		path := configFile(t, "yaml", "port: '${PORT}'")
+		_, err := LoadProject(path, referenceConfig{}, testLoader(func(string) (string, bool) { return value, true }))
+		var d *Error
+		if !errors.As(err, &d) || d.File != path || d.Env != "PORT" || d.Field != "port" || d.Line != 1 || d.Column < 1 || strings.Contains(err.Error(), value) {
+			t.Fatalf("invalid diagnostic: %v", err)
+		}
+	}
+	for _, raw := range []string{"${BAD-123}", "${}", "${X", "${1BAD}", "${BAD NAME}", "${X:-${Y}}"} {
+		encoded, _ := json.Marshal(map[string]string{"password": raw})
+		if _, err := LoadProject(configFile(t, "json", string(encoded)), referenceConfig{}, testLoader(noEnvironment)); err == nil {
+			t.Fatal("invalid syntax accepted", raw)
+		}
+	}
+	for _, value := range []string{string([]byte{0xff}), strings.Repeat("x", maxConfigBytes+1)} {
+		if _, err := LoadProject(configFile(t, "yaml", "password: '${SECRET}'"), referenceConfig{}, testLoader(func(string) (string, bool) { return value, true })); err == nil {
+			t.Fatal("unbounded/invalid environment")
+		}
+	}
+	path := configFile(t, "yaml", "labels:\n  a: '${BIG}'\n  b: '${BIG}'\n  c: '${BIG}'\n  d: '${BIG}'\n  e: '${BIG}'")
+	if _, err := LoadProject(path, referenceConfig{}, testLoader(func(string) (string, bool) { return strings.Repeat("x", maxConfigBytes), true })); err == nil {
+		t.Fatal("expansion budget bypassed")
+	}
+	// An environment value cannot inject an array/object or coerce dynamic null.
+	for _, raw := range []string{"[1,2]", "{\"x\":1}", "null"} {
+		_, err := LoadProject(configFile(t, "yaml", "numbers: '${VALUE}'"), referenceConfig{}, testLoader(func(string) (string, bool) { return raw, true }))
+		if err == nil {
+			t.Fatal("structure injected")
+		}
+	}
+}
+func TestReferenceCacheIsolationAndRemovedRules(t *testing.T) {
+	path := configFile(t, "yaml", "password: '${TOKEN}'")
+	for i := 0; i < 24; i++ {
+		t.Run(fmt.Sprint(i), func(t *testing.T) {
+			t.Parallel()
+			v := fmt.Sprint(i)
+			l := testLoader(func(string) (string, bool) { return v, true })
+			for n := 0; n < 4; n++ {
+				got, err := LoadProject(path, referenceConfig{}, l)
+				if err != nil || got.Password != v {
+					t.Fatal("load leaked", err)
+				}
+			}
+		})
+	}
+}
+func TestReferenceLookupPerLoadAndConcurrentLoader(t *testing.T) {
+	var mu sync.Mutex
+	reads := 0
+	l := testLoader(func(string) (string, bool) { mu.Lock(); defer mu.Unlock(); reads++; return "secret", true })
+	path := configFile(t, "yaml", "password: '${TOKEN}${TOKEN}'")
+	var wg sync.WaitGroup
+	for i := 0; i < 24; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			got, err := LoadProject(path, referenceConfig{}, l)
+			if err != nil || got.Password != "secretsecret" {
+				t.Error(err)
+			}
+		}()
+	}
+	wg.Wait()
+	if reads != 24 {
+		t.Fatal(reads)
+	}
+}
+func TestRemovedEnvTagsAndFieldSuggestion(t *testing.T) {
+	type old struct {
+		Value int `json:"value" envDefault:"9"`
+	}
+	if _, err := LoadProject("", old{}); err == nil || !strings.Contains(err.Error(), "removed") {
+		t.Fatal(err)
+	}
+	type oldSecret struct {
+		Token string `json:"-" env:"TOKEN"`
+	}
+	if _, err := DecodeFile(configFile(t, "json", `{}`), oldSecret{}); err == nil {
+		t.Fatal("old env tag ignored")
+	}
+	_, err := LoadProject(configFile(t, "yaml", "batchSiz: 10"), referenceConfig{})
+	if err == nil || !strings.Contains(err.Error(), `did you mean "batchSize"`) {
+		t.Fatal(err)
+	}
+	t.Setenv("GO_OMNI_BATCH_SIZE", "999")
+	got, err := LoadProject("", referenceConfig{BatchSize: 100})
+	if err != nil || got.BatchSize != 100 {
+		t.Fatal("implicit overlay", err)
+	}
+}
+func FuzzConfigurationReferences(f *testing.F) {
+	for _, s := range []string{"${X}", "$${X}", "${X:-DDS:abc:-123}", "${X:-}", "https://${X}/${X}", "${X:-${Y}}"} {
+		f.Add(s, " secret${NO}\n\" ")
+	}
+	f.Fuzz(func(t *testing.T, raw, value string) {
+		if len(raw) > 8192 || len(value) > 8192 {
+			return
+		}
+		doc := Document{Value: map[string]any{"password": raw}}
+		resolved, err := resolveDocument(doc, func(string) (string, bool) { return value, true })
+		if err != nil {
+			return
+		}
+		_, _ = bindDocument(resolved, referenceConfig{})
+	})
+}
+func BenchmarkExplicitConfiguration(b *testing.B) {
+	for _, refs := range []bool{false, true} {
+		b.Run(fmt.Sprint(refs), func(b *testing.B) {
+			source := `{"port":3306,"enabled":false,"password":"fixed","batchSize":0}`
+			if refs {
+				source = `{"port":"${PORT:-3306}","enabled":"${ENABLED:-false}","password":"${PASSWORD}","batchSize":0}`
+			}
+			path := b.TempDir() + "/config.json"
+			if err := os.WriteFile(path, []byte(source), 0600); err != nil {
+				b.Fatal(err)
+			}
+			l := testLoader(func(k string) (string, bool) { return "private", k == "PASSWORD" })
+			b.ReportAllocs()
+			b.ResetTimer()
+			for i := 0; i < b.N; i++ {
+				if _, err := LoadProject(path, referenceConfig{BatchSize: 100}, l); err != nil {
+					b.Fatal(err)
+				}
+			}
+		})
+	}
+}
--- a/config/suggestions.go
+++ b/config/suggestions.go
@@ -0,0 +1,51 @@
+package config
+
+import (
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// Suggest only a unique, nearby declared field. Input values are never used.
+func unknownFieldReason(name string, fields map[string]reflect.StructField) string {
+	if len(name) < 3 || len(name) > 128 {
+		return "unknown field"
+	}
+	best, match, tied := 3, "", false
+	for candidate := range fields {
+		if len(candidate) > 128 {
+			continue
+		}
+		d := fieldDistance(strings.ToLower(name), strings.ToLower(candidate))
+		if d < best {
+			best, match, tied = d, candidate, false
+		} else if d == best {
+			tied = true
+		}
+	}
+	if match != "" && !tied && best <= 2 {
+		return "unknown field; did you mean " + strconv.Quote(match) + "?"
+	}
+	return "unknown field"
+}
+func fieldDistance(a, b string) int {
+	prev := make([]int, len(b)+1)
+	for i := range prev {
+		prev[i] = i
+	}
+	for i := 0; i < len(a); i++ {
+		left, diagonal := i+1, prev[0]
+		prev[0] = left
+		for j := 0; j < len(b); j++ {
+			cost := 0
+			if a[i] != b[j] {
+				cost = 1
+			}
+			old := prev[j+1]
+			left = min(left+1, old+1, diagonal+cost)
+			prev[j+1] = left
+			diagonal = old
+		}
+	}
+	return prev[len(b)]
+}
--- a/contract/policy.go
+++ b/contract/policy.go
@@ -3,9 +3,11 @@ package contract
 import (
 	"context"
 	"errors"
-	"fmt"
 	"io"
+	"strings"
 	"unicode/utf8"
+
+	"git.yuntuo.hk/k2safe/go-omni/internal/configdiag"
 )

 // RequestPolicy describes protocol strictness, independently of business
@@ -35,7 +37,7 @@ func (p RequestPolicy) Validate() error {
 			ok = ok || value == item.value
 		}
 		if !ok {
-			return fmt.Errorf("request policy: invalid %s", item.name)
+			return configdiag.New(item.name, "must be one of "+strings.Join(item.allowed, ", "))
 		}
 	}
 	return nil
--- a/copyx/check.go
+++ b/copyx/check.go
@@ -0,0 +1,192 @@
+package copyx
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"sort"
+)
+
+// ErrDynamicType means a source interface requires a concrete runtime value.
+// An exact converter can explicitly own that dynamic boundary.
+var ErrDynamicType = errors.New("copyx: dynamic source type requires runtime validation or an exact converter")
+
+// Check validates a source/target type pair using the same options as Copy.
+// It never executes converters and requires no example values. Nil policies,
+// converter failures, map-key collisions and deep reference isolation still
+// require runtime checks. Options remain local; no mapping files or registration.
+func Check[S, T any](options ...Option) error {
+	c, err := New(options...)
+	if err != nil {
+		return err
+	}
+	return c.Check(reflect.TypeFor[S](), reflect.TypeFor[T]())
+}
+
+// Check validates types with an existing Copier's immutable settings. The target
+// is the result type (not Copy's extra output pointer). Safe for concurrent use.
+func (c *Copier) Check(source, target reflect.Type) error {
+	if c == nil {
+		return errors.New("copyx: nil Copier")
+	}
+	if source == nil || target == nil {
+		return errors.New("copyx: source and target types are required")
+	}
+	return newTypeChecker(&c.options, false).check(source, target, "$", 0)
+}
+
+type typeChecker struct {
+	options      *settings
+	allowDynamic bool
+	seen         map[pair]bool
+	nodes        int
+}
+
+func newTypeChecker(options *settings, allowDynamic bool) *typeChecker {
+	return &typeChecker{options: options, allowDynamic: allowDynamic, seen: map[pair]bool{}}
+}
+
+// Absent elements can reveal type/field mismatches, but contain no actual
+// resource handles or dynamic interface values to validate. Runtime checks stay
+// responsible for those value-dependent cases.
+func (s *state) checkAbsent(from, to reflect.Type, path string) error {
+	if s.checkedTypes == nil {
+		s.checkedTypes = map[pair]bool{}
+	}
+	checker := typeChecker{options: s.options, allowDynamic: true, seen: s.checkedTypes, nodes: s.checkedNodes}
+	err := checker.check(from, to, path, 0)
+	s.checkedNodes = checker.nodes
+	return err
+}
+func (c *typeChecker) check(from, to reflect.Type, path string, depth int) error {
+	c.nodes++
+	if depth > maxDepth || c.nodes > maxNodes {
+		return at(path, ErrLimit)
+	}
+	key := pair{from, to}
+	if c.seen[key] {
+		return nil
+	}
+	c.seen[key] = true
+	if !c.allowDynamic && !shallowSafe(to) {
+		return at(path, ErrUnsupported)
+	}
+	if _, ok := c.options.converters[key]; ok {
+		return nil
+	}
+	if from == to && len(c.options.converters) == 0 && len(c.options.fields) == 0 && !c.options.skipZero && c.options.nilPolicy != NilSkip {
+		if !c.options.deep || simpleValue(to) {
+			return nil
+		}
+	}
+	if from.Kind() == reflect.Interface {
+		if c.allowDynamic {
+			return nil
+		}
+		return at(path, ErrDynamicType)
+	}
+	if to.Kind() == reflect.Interface {
+		if !from.Implements(to) {
+			return at(path, ErrType)
+		}
+		return c.check(from, from, path, depth+1)
+	}
+	if !c.allowDynamic && c.options.deep && forbidden(to) {
+		return at(path, ErrUnsupported)
+	}
+	if from.Kind() == reflect.Pointer && to.Kind() != reflect.Pointer {
+		return c.check(from.Elem(), to, path, depth+1)
+	}
+	if to.Kind() == reflect.Pointer {
+		if !c.options.deep && from == to {
+			return nil
+		}
+		if from.Kind() == reflect.Pointer {
+			from = from.Elem()
+		}
+		return c.check(from, to.Elem(), path, depth+1)
+	}
+	if from.Kind() != to.Kind() {
+		return at(path, fmt.Errorf("%w: %s -> %s", ErrType, from, to))
+	}
+	if to == timeType && from == to {
+		return nil
+	}
+	switch to.Kind() {
+	case reflect.Struct:
+		for i := 0; i < to.NumField(); i++ {
+			f := to.Field(i)
+			if !c.allowDynamic && f.PkgPath != "" && (from != to || c.options.deep && privateMutable(f.Type)) {
+				return at(path+"."+f.Name, ErrUnsupported)
+			}
+		}
+		sources, targets := exportedFields(from), exportedFields(to)
+		rules := c.options.fields[key]
+		if rules == nil {
+			rules = &fields{}
+		}
+		reverse, used := map[string]string{}, map[string]bool{}
+		for a, b := range rules.names {
+			reverse[b] = a
+		}
+		for _, name := range sortedFieldNames(targets) {
+			if rules.ignoreTarget[name] {
+				continue
+			}
+			sourceName := name
+			if n, ok := reverse[name]; ok {
+				sourceName = n
+			}
+			source, ok := sources[sourceName]
+			if !ok || rules.ignoreSource[sourceName] {
+				return at(path+"."+name, ErrField)
+			}
+			used[sourceName] = true
+			if err := c.check(source.Type, targets[name].Type, path+"."+name, depth+1); err != nil {
+				return err
+			}
+		}
+		if c.options.strict {
+			for _, name := range sortedFieldNames(sources) {
+				if !used[name] && !rules.ignoreSource[name] {
+					return at(path+"."+name, ErrField)
+				}
+			}
+		}
+		return nil
+	case reflect.Slice:
+		if !c.options.deep && from == to {
+			return nil
+		}
+		return c.check(from.Elem(), to.Elem(), path+"[]", depth+1)
+	case reflect.Array:
+		if from.Len() != to.Len() {
+			return at(path, ErrType)
+		}
+		return c.check(from.Elem(), to.Elem(), path+"[]", depth+1)
+	case reflect.Map:
+		if !c.options.deep && from == to {
+			return nil
+		}
+		if err := c.check(from.Key(), to.Key(), path+"[key]", depth+1); err != nil {
+			return err
+		}
+		return c.check(from.Elem(), to.Elem(), path+"[value]", depth+1)
+	case reflect.Func, reflect.Chan, reflect.UnsafePointer:
+		if c.options.deep && !c.allowDynamic {
+			return at(path, ErrUnsupported)
+		}
+	}
+	if from != to {
+		return at(path, fmt.Errorf("%w: %s -> %s", ErrType, from, to))
+	}
+	return nil
+}
+func sortedFieldNames(fields map[string]reflect.StructField) []string {
+	names := make([]string, 0, len(fields))
+	for name := range fields {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+	return names
+}
--- a/copyx/check_test.go
+++ b/copyx/check_test.go
@@ -0,0 +1,192 @@
+package copyx_test
+
+import (
+	"errors"
+	"reflect"
+	"strings"
+	"sync"
+	"testing"
+
+	"git.yuntuo.hk/k2safe/go-omni/copyx"
+)
+
+type checkSource struct{ Rows []checkSourceRow }
+type checkSourceRow struct{ Value string }
+type checkTarget struct{ Rows []checkTargetRow }
+type checkTargetRow struct{ Value int }
+type recursiveSource struct {
+	Children []*recursiveSource
+	Value    string
+}
+type recursiveTarget struct {
+	Children []*recursiveTarget
+	Value    int
+}
+type recursiveCompatible struct {
+	Children []*recursiveCompatible
+	Value    string
+}
+
+func TestCheckTypesAndEmptyCollections(t *testing.T) {
+	err := copyx.Check[checkSource, checkTarget]()
+	var field *copyx.Error
+	if !errors.Is(err, copyx.ErrType) || !errors.As(err, &field) || field.Path != "$.Rows[].Value" {
+		t.Fatal(err)
+	}
+	for _, rows := range [][]checkSourceRow{nil, {}, {{Value: "42"}}} {
+		out := checkTarget{Rows: []checkTargetRow{{Value: 99}}}
+		if err := copyx.Copy(&out, checkSource{rows}); !errors.Is(err, copyx.ErrType) {
+			t.Fatalf("rows %v: %v", rows, err)
+		}
+		if len(out.Rows) != 1 || out.Rows[0].Value != 99 {
+			t.Fatal("partial target committed")
+		}
+	}
+	if err := copyx.Check[map[string]checkSourceRow, map[string]checkTargetRow](); !errors.Is(err, copyx.ErrType) {
+		t.Fatal(err)
+	}
+	var dst map[string]checkTargetRow
+	if err := copyx.Copy(&dst, map[string]checkSourceRow{}); !errors.Is(err, copyx.ErrType) {
+		t.Fatal(err)
+	}
+	var array [0]checkTargetRow
+	if err := copyx.Copy(&array, [0]checkSourceRow{}); !errors.Is(err, copyx.ErrType) {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[map[string]int, map[int]int](); !errors.Is(err, copyx.ErrType) {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[[2]int, [3]int](); !errors.Is(err, copyx.ErrType) {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[*recursiveSource, *recursiveTarget](); !errors.Is(err, copyx.ErrType) {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[*recursiveSource, *recursiveCompatible](copyx.WithDeepCopy()); err != nil {
+		t.Fatal(err)
+	}
+}
+func TestCheckRulesAndConverterBoundaries(t *testing.T) {
+	type from struct {
+		Name  string
+		Extra bool
+	}
+	type to struct {
+		Label string
+		Keep  int
+	}
+	options := []copyx.Option{copyx.WithStrictFields(), copyx.WithFieldNames[from, to](map[string]string{"Name": "Label"}), copyx.WithIgnoreSource[from, to]("Extra"), copyx.WithIgnoreTarget[from, to]("Keep")}
+	if err := copyx.Check[from, to](options...); err != nil {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[from, to](); !errors.Is(err, copyx.ErrField) {
+		t.Fatal(err)
+	}
+	type short struct{ Name string }
+	if err := copyx.Check[from, short](copyx.WithStrictFields()); !errors.Is(err, copyx.ErrField) {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[checkSource, checkTarget](copyx.WithConverter(func(string) (int, error) { panic("check must not execute converters") })); err != nil {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[struct{ Value any }, struct{ Value int }](); !errors.Is(err, copyx.ErrDynamicType) {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[any, int](copyx.WithConverter(func(any) (int, error) { panic("not called") })); err != nil {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[*int, int](); err != nil {
+		t.Fatal(err)
+	} // Actual nil remains a runtime error.
+	var src *int
+	dst := 1
+	if err := copyx.Copy(&dst, src); !errors.Is(err, copyx.ErrNil) || dst != 1 {
+		t.Fatal(err)
+	}
+	var empty []int
+	if err := copyx.Copy(&empty, []any{}); err != nil || empty == nil {
+		t.Fatal("dynamic emptiness changed", err)
+	}
+	if err := copyx.Check[sync.Mutex, sync.Mutex](); !errors.Is(err, copyx.ErrUnsupported) {
+		t.Fatal(err)
+	}
+	option := copyx.WithConverter(func(v []int) ([]int, error) { return v, nil })
+	if err := copyx.Check[[]int, []int](copyx.WithDeepCopy(), option); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := copyx.Clone([]int{1}, option); !errors.Is(err, copyx.ErrSharedReference) {
+		t.Fatal("type check bypassed graph audit", err)
+	}
+}
+func TestCopierCheckConcurrentAndOptionsIsolation(t *testing.T) {
+	good, _ := copyx.New(copyx.WithConverter(func(string) (int, error) { return 42, nil }))
+	bad, _ := copyx.New()
+	var wg sync.WaitGroup
+	for i := 0; i < 24; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for j := 0; j < 20; j++ {
+				if err := good.Check(reflect.TypeFor[checkSource](), reflect.TypeFor[checkTarget]()); err != nil {
+					t.Error(err)
+				}
+				if err := bad.Check(reflect.TypeFor[checkSource](), reflect.TypeFor[checkTarget]()); !errors.Is(err, copyx.ErrType) {
+					t.Error(err)
+				}
+				var target checkTarget
+				if err := good.Copy(&target, checkSource{Rows: []checkSourceRow{}}); err != nil || target.Rows == nil {
+					t.Error(err)
+				}
+			}
+		}()
+	}
+	wg.Wait()
+	if err := good.Check(nil, reflect.TypeFor[int]()); err == nil {
+		t.Fatal("nil type accepted")
+	}
+	var absent *copyx.Copier
+	if err := absent.Check(reflect.TypeFor[int](), reflect.TypeFor[int]()); err == nil {
+		t.Fatal("nil copier accepted")
+	}
+	if err := copyx.Check[int, string](); err == nil || !strings.Contains(err.Error(), "int -> string") {
+		t.Fatal(err)
+	}
+}
+func BenchmarkTypeCheck(b *testing.B) {
+	c, _ := copyx.New(copyx.WithConverter(func(string) (int, error) { return 1, nil }))
+	from, to := reflect.TypeFor[checkSource](), reflect.TypeFor[checkTarget]()
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		if err := c.Check(from, to); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func TestEmptyTypeCheckPreservesAbsentValueSemantics(t *testing.T) {
+	var callback func()
+	if out, err := copyx.Clone(callback); err != nil || out != nil {
+		t.Fatal(err)
+	}
+	if out, err := copyx.Clone([]func(){}); err != nil || out == nil || len(out) != 0 {
+		t.Fatal(err)
+	}
+	if _, err := copyx.Clone([]func(){func() {}}); !errors.Is(err, copyx.ErrUnsupported) {
+		t.Fatal(err)
+	}
+	if err := copyx.Check[[]func(), []func()](copyx.WithDeepCopy()); !errors.Is(err, copyx.ErrUnsupported) {
+		t.Fatal("preflight must report potentially non-nil handles", err)
+	}
+	type from struct {
+		Ignored *int
+		Value   string
+	}
+	type to struct {
+		Ignored *int
+		Value   int
+	}
+	var dst []to
+	if err := copyx.Copy(&dst, []from{}, copyx.WithDeepCopy()); !errors.Is(err, copyx.ErrType) {
+		t.Fatal(err)
+	}
+}
--- a/copyx/copy.go
+++ b/copyx/copy.go
@@ -89,12 +89,14 @@ type visit struct {
 	target reflect.Type
 }
 type state struct {
-	options   *settings
-	seen      map[visit]reflect.Value
-	graph     *graph
-	nodes     int
-	allocated uint64
-	valueRoot *reference
+	options      *settings
+	seen         map[visit]reflect.Value
+	graph        *graph
+	nodes        int
+	allocated    uint64
+	valueRoot    *reference
+	checkedTypes map[pair]bool
+	checkedNodes int
 }

 func (s *state) reserve(count int, size uintptr, path string) error {
@@ -239,6 +241,11 @@ func (s *state) walk(src, base reflect.Value, t reflect.Type, path string, depth
 	case reflect.Struct:
 		return s.structure(src, base, t, path, depth)
 	case reflect.Slice:
+		if src.Len() == 0 {
+			if err := s.checkAbsent(src.Type(), t, path); err != nil {
+				return reflect.Value{}, err
+			}
+		}
 		if !s.options.deep && src.Type() == t {
 			return src, nil
 		}
@@ -264,6 +271,11 @@ func (s *state) walk(src, base reflect.Value, t reflect.Type, path string, depth
 		}
 		return out, nil
 	case reflect.Array:
+		if src.Len() == 0 {
+			if err := s.checkAbsent(src.Type(), t, path); err != nil {
+				return reflect.Value{}, err
+			}
+		}
 		if src.Len() != t.Len() {
 			return reflect.Value{}, at(path, ErrType)
 		}
@@ -280,6 +292,11 @@ func (s *state) walk(src, base reflect.Value, t reflect.Type, path string, depth
 		}
 		return out, nil
 	case reflect.Map:
+		if src.Len() == 0 {
+			if err := s.checkAbsent(src.Type(), t, path); err != nil {
+				return reflect.Value{}, err
+			}
+		}
 		if !s.options.deep && src.Type() == t {
 			return src, nil
 		}
--- a/cors/README.md
+++ b/cors/README.md
@@ -0,0 +1,82 @@
+# 可选 CORS
+
+CORS 控制浏览器能否跨源读取 HTTP 响应。默认关闭；同源反向代理可以保持关闭。模块无 Gin 或具体业务依赖，标准库/native/HTTP2 与自定义 Runner 使用相同 App 接入策略。
+
+## 生成项目只改配置
+
+在既有 `etc/config.yaml` 的 `server` 中加入，无需修改 main、svc 或每条 `.api` 路由：
+
+```yaml
+server:
+  cors:
+    enabled: true
+    allowedOrigins:
+      - https://admin.example.com
+      - https://merchant.example.com
+    allowedMethods: [GET, HEAD, POST, PUT, PATCH, DELETE]
+    allowedHeaders: [Authorization, Content-Type]
+    exposedHeaders: [X-Request-ID, Content-Disposition]
+    allowCredentials: false
+    maxAge: 10m
+```
+
+文件也可显式引用环境变量：`allowedOrigins: ["${WEB_ORIGIN}"]`。一个数组元素代表一个来源，不把逗号分隔环境文本隐式拆成多个来源。JSON/YAML/XML 走同一加载和校验；非法配置定位 `server.cors.allowedOrigins[0]` 等字段、文件及可用环境名/行列，不回显值。
+
+```sh
+go run . -config etc/config.yaml -check-config
+go run ./examples/cors # 在框架源码根目录运行独立示例
+```
+
+## 手写项目与独立 HTTP 服务
+
+```go
+app := omni.New(omni.WithCORS(omni.CORSConfig{
+    Enabled: true,
+    AllowedOrigins: []string{"https://web.example.com"},
+    AllowedMethods: []string{"GET", "POST"},
+    AllowedHeaders: []string{"Authorization", "Content-Type"},
+}))
+```
+
+已有 net/http 服务也可单独使用，不需要创建 App：
+
+```go
+policy, err := cors.New(cors.Config{
+    Enabled: true,
+    AllowedOrigins: []string{"https://web.example.com"},
+})
+if err != nil { return err }
+handler := policy.Wrap(existingHandler)
+```
+
+Config/New/WithCORS 在初始化时校验并快照配置；同一 Policy 可并发复用。`Config.Validate()` 返回 error，直接向 `omni.New` 传非法选项沿用框架初始化 panic 约定；生成项目在创建 App 前已校验。
+
+## 配置规则
+
+| 字段 | 规则 |
+| --- | --- |
+| enabled | 默认 false；关闭时直接使用原 Handler，不添加头、不拦截 OPTIONS |
+| allowedOrigins | 启用时必填。完整 HTTP(S) origin（协议＋主机＋可选端口），无路径、尾斜杠、userinfo、查询或片段。配置中的协议/主机转小写、默认 80/443 端口省略；请求匹配浏览器序列化后的来源 |
+| allowedMethods | 空列表默认 GET、HEAD、POST；填写后使用指定集合。大写方法名，拒绝浏览器禁止的 CONNECT/TRACE/TRACK，不提供方法通配符 |
+| allowedHeaders | 空列表不批准额外预检请求头。Authorization、JSON Content-Type 等按需要列出；名称忽略大小写，不提供通配符 |
+| exposedHeaders | 默认空；额外允许前端 JS 读取的响应头，例如下载文件名用 Content-Disposition。浏览器本来就可读取的安全列表不需重复填写 |
+| allowCredentials | 默认 false；跨源 Cookie 等凭据模式需要显式 true 和具体来源。单纯手动设置 Authorization 头只需列入 allowedHeaders，不必因此开启 Cookie 凭据模式 |
+| maxAge | 浏览器缓存预检结果的时长，必须非负且为整秒；0 不发送该头。浏览器可按自身上限截短 |
+
+公开无凭据 API 可使用唯一来源 `"*"`；与 `allowCredentials: true` 或其他来源并存会报错。此版本只支持 HTTP(S) 来源，拒绝 `null`、子域通配符、正则、file:// 和不透明来源。国际化域名填写浏览器发送的 ASCII/Punycode 形式；IP 使用完整标准形式。不会为匹配来源查询 DNS。
+
+## 预检、错误响应与安全边界
+
+- CORS 位于路由/业务中间件外层。只有 OPTIONS 且同时带 Origin 和 Access-Control-Request-Method 才视为预检；普通 OPTIONS 继续执行项目逻辑。
+- 合法预检返回 **204 空响应**，不进入业务中间件、鉴权、Logic 或业务响应包装。拒绝预检返回 **403 空响应**，不暴露内部原因；两者是协议响应，不受业务“失败也返回 HTTP 200”的设置影响。
+- 预检验证全局来源、方法、请求头策略，不探测路由存在性；通过不代表实际接口一定存在。实际请求仍由路由处理，可返回 404/405。
+- 实际请求继续正常鉴权；来源/方法获准时，正常响应、401/403、404/405、框架恢复的 500 都带 CORS 头，响应体、状态和错误目录不变。协议解析、TLS、网络层过载等在进入 App 前发生的拒绝不由本模块改写。
+- 未获准或没有 Origin 的实际请求仍正常进入业务，只是不添加 CORS 许可头。CORS 不等于身份认证、服务端访问控制或 CSRF 防护；服务端回调仍需项目自己的验签/鉴权。
+- 始终追加并去重 `Vary: Origin`；预检再追加请求方法/请求头的 Vary，保留原有 Vary 与 `*`。不要在下游代码覆盖这些头。代理与应用选择一处负责 CORS，避免重复头或冲突策略。
+- 不包装 ResponseWriter、不读取/缓存 body、不克隆 Request。下载、上传、Flush、Hijack 和请求上下文保留；不增加响应体大小限制或改写统一返回格式。
+- 使用 App、Engine、NewServer 或 Run/ServeContext/RunWith 接入。Router() 暴露底层路由供高级注册，单独拿 Router().ServeHTTP 服务会绕过应用的外层策略。
+- App 内业务日志/指标不统计被提前结束的预检；如需记录全部流量，在 App 外层或代理配置访问日志。不要让全局登录校验挡在 CORS 预检之前。
+
+配置最多 1024 个来源、每个最多 4096 字节；方法/请求头/暴露头各最多 128 个且名称最多 256 字节；预检请求头列表最多 128 项、8192 字节。拒绝 CRLF、歧义的重复 Origin/请求方法及非法 token。WebSocket Origin 校验、Private Network Access 扩展和云桶 CORS 不包含在本模块中，按对应服务配置。
+
+规则依据：[Fetch CORS 协议](https://fetch.spec.whatwg.org/#http-cors-protocol)、[凭据规则](https://fetch.spec.whatwg.org/#cors-protocol-and-credentials)、[缓存规则](https://fetch.spec.whatwg.org/#cors-protocol-and-http-caches)。可运行示例：[examples/cors](../examples/cors/README.md)。
--- a/cors/config.go
+++ b/cors/config.go
@@ -0,0 +1,144 @@
+// Package cors implements optional, transport-independent browser CORS policy.
+// It does not authenticate requests or provide CSRF protection.
+package cors
+
+import (
+	"net"
+	"net/netip"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/internal/configdiag"
+)
+
+// Config is disabled by default. Origins are exact HTTP(S) origins, or a single
+// "*" for public responses without credentials. Patterns and "null" are rejected.
+// Empty methods default to GET, HEAD, POST; empty header lists grant no extra
+// permissions. MaxAge is a nonnegative whole number of seconds; zero omits it.
+type Config struct {
+	Enabled          bool          `json:"enabled"`
+	AllowedOrigins   []string      `json:"allowedOrigins"`
+	AllowedMethods   []string      `json:"allowedMethods"`
+	AllowedHeaders   []string      `json:"allowedHeaders"`
+	ExposedHeaders   []string      `json:"exposedHeaders"`
+	AllowCredentials bool          `json:"allowCredentials"`
+	MaxAge           time.Duration `json:"maxAge"`
+}
+
+func (c Config) Clone() Config {
+	c.AllowedOrigins = append([]string(nil), c.AllowedOrigins...)
+	c.AllowedMethods = append([]string(nil), c.AllowedMethods...)
+	c.AllowedHeaders = append([]string(nil), c.AllowedHeaders...)
+	c.ExposedHeaders = append([]string(nil), c.ExposedHeaders...)
+	return c
+}
+
+// Validate never echoes configured values in diagnostics. Invalid settings are
+// rejected even when disabled; an empty origin list is legal only when disabled.
+func (c Config) Validate() error {
+	if c.Enabled && len(c.AllowedOrigins) == 0 {
+		return configdiag.New("allowedOrigins", "is required when CORS is enabled")
+	}
+	if c.MaxAge < 0 || c.MaxAge%time.Second != 0 {
+		return configdiag.New("maxAge", "must be a nonnegative whole number of seconds")
+	}
+	if len(c.AllowedOrigins) > 1024 {
+		return configdiag.New("allowedOrigins", "must contain at most 1024 entries")
+	}
+	for i, origin := range c.AllowedOrigins {
+		field := "allowedOrigins[" + strconv.Itoa(i) + "]"
+		if origin == "*" {
+			if c.AllowCredentials || len(c.AllowedOrigins) != 1 {
+				return configdiag.New(field, "wildcard requires a single origin entry and allowCredentials=false")
+			}
+		} else if _, ok := normalizeOrigin(origin); !ok {
+			return configdiag.New(field, "must be an HTTP(S) origin without credentials, path, query, fragment or wildcard")
+		}
+	}
+	for _, list := range []struct {
+		name   string
+		values []string
+	}{{"allowedMethods", c.AllowedMethods}, {"allowedHeaders", c.AllowedHeaders}, {"exposedHeaders", c.ExposedHeaders}} {
+		if len(list.values) > 128 {
+			return configdiag.New(list.name, "must contain at most 128 entries")
+		}
+		for i, value := range list.values {
+			field := list.name + "[" + strconv.Itoa(i) + "]"
+			if !token(value) || value == "*" {
+				return configdiag.New(field, "must be an explicit HTTP token, not a wildcard")
+			}
+			if list.name == "allowedMethods" && (value != strings.ToUpper(value) || value == "CONNECT" || value == "TRACE" || value == "TRACK") {
+				return configdiag.New(field, "must be an uppercase browser-allowed HTTP method")
+			}
+		}
+	}
+	return nil
+}
+
+// Normalize configured scheme/host case and default ports once. Request values
+// match serialized browser origins; arbitrary URL prefixes/suffixes never match.
+func normalizeOrigin(origin string) (string, bool) {
+	if len(origin) == 0 || len(origin) > 4096 {
+		return "", false
+	}
+	for _, b := range []byte(origin) {
+		if b <= 32 || b >= 127 || strings.ContainsRune("\\%?#*", rune(b)) {
+			return "", false
+		}
+	}
+	u, err := url.Parse(origin)
+	if err != nil || u.User != nil || u.Opaque != "" || u.Path != "" || u.RawQuery != "" || u.Fragment != "" || u.Host == "" {
+		return "", false
+	}
+	scheme, host := strings.ToLower(u.Scheme), strings.ToLower(u.Hostname())
+	if (scheme != "http" && scheme != "https") || host == "" || strings.HasSuffix(u.Host, ":") {
+		return "", false
+	}
+	if strings.Contains(host, ":") {
+		ip, err := netip.ParseAddr(host)
+		if err != nil || !ip.Is6() || ip.Zone() != "" {
+			return "", false
+		}
+		host = "[" + ip.String() + "]"
+		if ip.Is4In6() {
+			// Browsers serialize mapped IPv4 as hex IPv6 pieces; netip.String
+			// uses a dotted-decimal tail instead.
+			b := ip.As16()
+			host = "[::ffff:" + strconv.FormatUint(uint64(b[12])<<8|uint64(b[13]), 16) + ":" + strconv.FormatUint(uint64(b[14])<<8|uint64(b[15]), 16) + "]"
+		}
+	} else {
+		if strings.ContainsAny(u.Host, "[]") {
+			return "", false
+		}
+		for _, b := range []byte(host) {
+			if !(b >= 'a' && b <= 'z' || b >= '0' && b <= '9' || b == '.' || b == '-') {
+				return "", false
+			}
+		}
+	}
+	port := u.Port()
+	if port != "" {
+		n, err := strconv.Atoi(port)
+		if err != nil || n < 1 || n > 65535 {
+			return "", false
+		}
+		if !(scheme == "https" && n == 443 || scheme == "http" && n == 80) {
+			host = net.JoinHostPort(strings.Trim(host, "[]"), strconv.Itoa(n))
+		}
+	}
+	return scheme + "://" + host, true
+}
+
+func token(s string) bool {
+	if s == "" || len(s) > 256 {
+		return false
+	}
+	for _, b := range []byte(s) {
+		if !(b >= 'a' && b <= 'z' || b >= 'A' && b <= 'Z' || b >= '0' && b <= '9' || strings.ContainsRune("!#$%&'*+-.^_`|~", rune(b))) {
+			return false
+		}
+	}
+	return true
+}
--- a/cors/cors.go
+++ b/cors/cors.go
@@ -0,0 +1,187 @@
+package cors
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Policy is immutable after New and safe to share between concurrent requests.
+type Policy struct {
+	enabled, wildcard, credentials                    bool
+	origins, methods, headers                         map[string]struct{}
+	allowMethods, allowHeaders, exposeHeaders, maxAge string
+}
+
+// New validates and snapshots policy. It performs no network or DNS operations.
+func New(c Config) (*Policy, error) {
+	if err := c.Validate(); err != nil {
+		return nil, err
+	}
+	p := &Policy{enabled: c.Enabled, credentials: c.AllowCredentials}
+	if !c.Enabled {
+		return p, nil
+	}
+	p.origins = make(map[string]struct{}, len(c.AllowedOrigins))
+	for _, origin := range c.AllowedOrigins {
+		if origin == "*" {
+			p.wildcard = true
+			continue
+		}
+		normalized, _ := normalizeOrigin(origin)
+		p.origins[normalized] = struct{}{}
+	}
+	methods := c.AllowedMethods
+	if len(methods) == 0 {
+		methods = []string{http.MethodGet, http.MethodHead, http.MethodPost}
+	}
+	p.methods, p.allowMethods = compileList(methods, false)
+	p.headers, p.allowHeaders = compileList(c.AllowedHeaders, true)
+	_, p.exposeHeaders = compileList(c.ExposedHeaders, true)
+	if c.MaxAge > 0 {
+		p.maxAge = strconv.FormatInt(int64(c.MaxAge/time.Second), 10)
+	}
+	return p, nil
+}
+
+func compileList(values []string, header bool) (map[string]struct{}, string) {
+	set := make(map[string]struct{}, len(values))
+	list := make([]string, 0, len(values))
+	for _, value := range values {
+		key := value
+		if header {
+			key = strings.ToLower(value)
+			value = http.CanonicalHeaderKey(value)
+		}
+		if _, exists := set[key]; exists {
+			continue
+		}
+		set[key] = struct{}{}
+		list = append(list, value)
+	}
+	return set, strings.Join(list, ", ")
+}
+
+// Wrap installs CORS outside routing/authentication. Only actual CORS preflights
+// are short-circuited. Actual requests always continue through normal handlers;
+// an unlisted Origin receives no permission to read the response in a browser.
+// The original ResponseWriter, Request and body pass through without buffering.
+func (p *Policy) Wrap(next http.Handler) http.Handler {
+	if next == nil {
+		panic("cors: nil handler")
+	}
+	if p == nil {
+		panic("cors: nil policy")
+	}
+	if !p.enabled {
+		return next
+	}
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		h := w.Header()
+		vary(h, "Origin")
+		origins := r.Header.Values("Origin")
+		// An OPTIONS request without Origin or Access-Control-Request-Method is
+		// ordinary application traffic, including user-defined OPTIONS handlers.
+		requestedMethods := r.Header.Values("Access-Control-Request-Method")
+		preflight := r.Method == http.MethodOptions && len(origins) > 0 && len(requestedMethods) > 0
+		if preflight {
+			vary(h, "Access-Control-Request-Method")
+			vary(h, "Access-Control-Request-Headers")
+		}
+		if len(origins) != 1 || !p.allowsOrigin(origins[0]) {
+			if preflight {
+				w.WriteHeader(http.StatusForbidden)
+				return
+			}
+			next.ServeHTTP(w, r)
+			return
+		}
+		if preflight {
+			if len(requestedMethods) != 1 || !p.allowsMethod(requestedMethods[0]) || !p.allowsHeaders(r.Header.Values("Access-Control-Request-Headers")) {
+				w.WriteHeader(http.StatusForbidden)
+				return
+			}
+			p.allowOrigin(h, origins[0])
+			h.Set("Access-Control-Allow-Methods", p.allowMethods)
+			if p.allowHeaders != "" {
+				h.Set("Access-Control-Allow-Headers", p.allowHeaders)
+			}
+			if p.maxAge != "" {
+				h.Set("Access-Control-Max-Age", p.maxAge)
+			}
+			w.WriteHeader(http.StatusNoContent)
+			return
+		}
+		// Match the actual method too: this grants response access, not permission
+		// to execute a side effect. Authentication/CSRF checks remain in the app.
+		if p.allowsMethod(r.Method) {
+			p.allowOrigin(h, origins[0])
+			if p.exposeHeaders != "" {
+				h.Set("Access-Control-Expose-Headers", p.exposeHeaders)
+			}
+		}
+		next.ServeHTTP(w, r)
+	})
+}
+
+func (p *Policy) allowsOrigin(origin string) bool {
+	if !p.wildcard {
+		_, ok := p.origins[origin]
+		return ok
+	}
+	normalized, ok := normalizeOrigin(origin)
+	return ok && normalized == origin
+}
+func (p *Policy) allowsMethod(method string) bool { _, ok := p.methods[method]; return ok }
+func (p *Policy) allowOrigin(h http.Header, origin string) {
+	if p.wildcard {
+		origin = "*"
+	}
+	h.Set("Access-Control-Allow-Origin", origin)
+	if p.credentials {
+		h.Set("Access-Control-Allow-Credentials", "true")
+	}
+}
+func (p *Policy) allowsHeaders(lines []string) bool {
+	count, size := 0, 0
+	for _, line := range lines {
+		size += len(line)
+		if size > 8192 {
+			return false
+		}
+		// Parse a header list without allocating an attacker-sized split slice.
+		for {
+			name, rest, more := strings.Cut(line, ",")
+			name = strings.Trim(name, " \t")
+			count++
+			if count > 128 || !token(name) {
+				return false
+			}
+			if _, ok := p.headers[strings.ToLower(name)]; !ok {
+				return false
+			}
+			if !more {
+				break
+			}
+			line = rest
+		}
+	}
+	return true
+}
+func vary(h http.Header, name string) {
+	for _, line := range h.Values("Vary") {
+		for {
+			v, rest, more := strings.Cut(line, ",")
+			v = strings.TrimSpace(v)
+			if v == "*" || strings.EqualFold(v, name) {
+				return
+			}
+			if !more {
+				break
+			}
+			line = rest
+		}
+	}
+	h.Add("Vary", name)
+}
--- a/cors/cors_test.go
+++ b/cors/cors_test.go
@@ -0,0 +1,303 @@
+package cors
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"reflect"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+func exampleConfig() Config {
+	return Config{Enabled: true, AllowedOrigins: []string{"https://admin.example", "https://merchant.example"}, AllowedMethods: []string{"GET", "POST", "DELETE"}, AllowedHeaders: []string{"Authorization", "Content-Type"}, ExposedHeaders: []string{"X-Request-ID", "Content-Disposition"}, MaxAge: 10 * time.Minute}
+}
+
+func TestPolicyPreflightAndActual(t *testing.T) {
+	for _, tc := range []struct {
+		name, method, origin, requestedMethod, requestedHeaders string
+		status                                                  int
+		called, allowed                                         bool
+	}{
+		{"preflight", "OPTIONS", "https://admin.example", "POST", "authorization, CONTENT-TYPE", 204, false, true},
+		{"no request headers", "OPTIONS", "https://admin.example", "DELETE", "", 204, false, true},
+		{"unknown origin", "OPTIONS", "https://other.example", "POST", "authorization", 403, false, false},
+		{"suffix attack", "OPTIONS", "https://admin.example.evil", "POST", "", 403, false, false},
+		{"scheme mismatch", "OPTIONS", "http://admin.example", "POST", "", 403, false, false},
+		{"port mismatch", "OPTIONS", "https://admin.example:444", "POST", "", 403, false, false},
+		{"opaque origin", "OPTIONS", "null", "POST", "", 403, false, false},
+		{"unknown method", "OPTIONS", "https://admin.example", "PATCH", "", 403, false, false},
+		{"case sensitive method", "OPTIONS", "https://admin.example", "post", "", 403, false, false},
+		{"unknown header", "OPTIONS", "https://admin.example", "POST", "X-Internal", 403, false, false},
+		{"trailing empty header", "OPTIONS", "https://admin.example", "POST", "Authorization,", 403, false, false},
+		{"control header", "OPTIONS", "https://admin.example", "POST", "Authorization\r\nX-Evil", 403, false, false},
+		{"duplicate allowed header", "OPTIONS", "https://admin.example", "POST", "Authorization, authorization", 204, false, true},
+		{"oversized list", "OPTIONS", "https://admin.example", "POST", strings.Repeat("Authorization,", 129) + "Authorization", 403, false, false},
+		{"actual error response", "GET", "https://merchant.example", "", "", 401, true, true},
+		{"actual denied origin still authenticates", "POST", "https://other.example", "", "", 401, true, false},
+		{"actual denied method still authenticates", "PUT", "https://admin.example", "", "", 401, true, false},
+		{"server callback", "POST", "", "", "", 401, true, false},
+		{"ordinary OPTIONS", "OPTIONS", "https://admin.example", "", "", 401, true, false},
+		{"OPTIONS without Origin", "OPTIONS", "", "POST", "", 401, true, false},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			policy, err := New(exampleConfig())
+			if err != nil {
+				t.Fatal(err)
+			}
+			called := false
+			h := policy.Wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				called = true
+				w.WriteHeader(401)
+				io.WriteString(w, "authentication required")
+			}))
+			r := httptest.NewRequest(tc.method, "http://api.example/resource", nil)
+			if tc.origin != "" {
+				r.Header.Set("Origin", tc.origin)
+			}
+			if tc.requestedMethod != "" {
+				r.Header.Set("Access-Control-Request-Method", tc.requestedMethod)
+			}
+			if tc.requestedHeaders != "" {
+				r.Header.Set("Access-Control-Request-Headers", tc.requestedHeaders)
+			}
+			w := httptest.NewRecorder()
+			w.Header().Add("Vary", "Accept-Encoding")
+			h.ServeHTTP(w, r)
+			if w.Code != tc.status || called != tc.called {
+				t.Fatalf("status=%d called=%v", w.Code, called)
+			}
+			if got := w.Header().Get("Access-Control-Allow-Origin"); (got != "") != tc.allowed || tc.allowed && got != tc.origin {
+				t.Fatal(w.Header())
+			}
+			if !strings.Contains(strings.Join(w.Header().Values("Vary"), ","), "Origin") || !strings.Contains(strings.Join(w.Header().Values("Vary"), ","), "Accept-Encoding") {
+				t.Fatal(w.Header())
+			}
+			if !tc.called {
+				if w.Body.Len() != 0 {
+					t.Fatal("preflight wrapped in business response")
+				}
+				if !strings.Contains(strings.Join(w.Header().Values("Vary"), ","), "Access-Control-Request-Headers") {
+					t.Fatal(w.Header())
+				}
+				if tc.allowed && (w.Header().Get("Access-Control-Max-Age") != "600" || !strings.Contains(w.Header().Get("Access-Control-Allow-Headers"), "Authorization")) {
+					t.Fatal(w.Header())
+				}
+			} else if w.Body.String() != "authentication required" {
+				t.Fatal(w.Body.String())
+			}
+			if tc.called && tc.allowed && w.Header().Get("Access-Control-Expose-Headers") != "X-Request-Id, Content-Disposition" {
+				t.Fatal(w.Header())
+			}
+		})
+	}
+}
+
+func TestPolicyValidation(t *testing.T) {
+	for _, origin := range []string{"https://admin.example/", "https://user:password@admin.example", "null", "https://*.example", "https://admin.example?secret", "https://admin.example#secret", "file://host", "https://host:", "https://host:0", "https://host:65536", "https://host%2eevil", "https://host\r\nX: value", "https://例子.example", "https://[localhost]", "https://[::1%25zone]"} {
+		c := exampleConfig()
+		c.AllowedOrigins = []string{origin}
+		err := c.Validate()
+		if err == nil || strings.Contains(err.Error(), origin) {
+			t.Fatalf("invalid origin accepted or exposed: %q %v", origin, err)
+		}
+	}
+	for _, change := range []func(*Config){
+		func(c *Config) { c.AllowedOrigins = nil },
+		func(c *Config) { c.AllowedOrigins = []string{"*"}; c.AllowCredentials = true },
+		func(c *Config) { c.AllowedOrigins = []string{"*", "https://admin.example"} },
+		func(c *Config) { c.AllowedHeaders = []string{"*"} },
+		func(c *Config) { c.ExposedHeaders = []string{"header\r\n"} },
+		func(c *Config) { c.AllowedMethods = []string{"get"} },
+		func(c *Config) { c.AllowedMethods = []string{"TRACE"} },
+		func(c *Config) { c.MaxAge = -time.Second },
+		func(c *Config) { c.MaxAge = time.Millisecond },
+	} {
+		c := exampleConfig()
+		change(&c)
+		if _, err := New(c); err == nil {
+			t.Fatal(c)
+		}
+	}
+	if err := (Config{}).Validate(); err != nil {
+		t.Fatal(err)
+	}
+	for input, want := range map[string]string{"https://[::ffff:192.0.2.1]": "https://[::ffff:c000:201]", "https://[::ffff:c000:201]": "https://[::ffff:c000:201]", "https://ADMIN.EXAMPLE:443": "https://admin.example", "http://localhost:80": "http://localhost", "http://localhost:8080": "http://localhost:8080", "https://[::1]:443": "https://[::1]", "http://[::1]:8080": "http://[::1]:8080"} {
+		got, ok := normalizeOrigin(input)
+		if !ok || got != want {
+			t.Fatalf("%q => %q %v", input, got, ok)
+		}
+	}
+}
+
+func TestPolicyCredentialsWildcardAndDuplicates(t *testing.T) {
+	for _, credentials := range []bool{false, true} {
+		c := exampleConfig()
+		c.AllowCredentials = credentials
+		if !credentials {
+			c.AllowedOrigins = []string{"*"}
+		}
+		p, _ := New(c)
+		for _, origin := range []string{"https://admin.example", "null", "https://admin.example/path", "https://bad\r\n"} {
+			r := httptest.NewRequest("GET", "/", nil)
+			r.Header.Set("Origin", origin)
+			w := httptest.NewRecorder()
+			p.Wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(200) })).ServeHTTP(w, r)
+			if origin != "https://admin.example" {
+				if w.Header().Get("Access-Control-Allow-Origin") != "" {
+					t.Fatal(w.Header())
+				}
+				continue
+			}
+			want := "*"
+			if credentials {
+				want = origin
+			}
+			if w.Header().Get("Access-Control-Allow-Origin") != want || (w.Header().Get("Access-Control-Allow-Credentials") == "true") != credentials {
+				t.Fatal(w.Header())
+			}
+		}
+	}
+	p, _ := New(exampleConfig())
+	for _, header := range []string{"Origin", "Access-Control-Request-Method"} {
+		r := httptest.NewRequest("OPTIONS", "/", nil)
+		r.Header.Set("Origin", "https://admin.example")
+		r.Header.Set("Access-Control-Request-Method", "POST")
+		r.Header.Add(header, r.Header.Get(header))
+		w := httptest.NewRecorder()
+		p.Wrap(http.HandlerFunc(func(http.ResponseWriter, *http.Request) { t.Fatal("ambiguous preflight reached handler") })).ServeHTTP(w, r)
+		if w.Code != 403 || w.Header().Get("Access-Control-Allow-Origin") != "" {
+			t.Fatal(w.Code, w.Header())
+		}
+	}
+}
+
+func TestPolicyPreservesHTTPAndSnapshot(t *testing.T) {
+	c := exampleConfig()
+	p, _ := New(c)
+	c.AllowedOrigins[0] = "https://evil.example"
+	c.AllowedHeaders[0] = "X-Evil"
+	r := httptest.NewRequest("GET", "/", strings.NewReader("request"))
+	r.Header.Set("Origin", "https://admin.example")
+	type key struct{}
+	r = r.WithContext(context.WithValue(r.Context(), key{}, "kept"))
+	w := httptest.NewRecorder()
+	w.Header().Set("Vary", "Accept-Encoding, origin")
+	next := http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		if writer != w || request != r || request.Context().Value(key{}) != "kept" {
+			t.Fatal("HTTP capabilities replaced")
+		}
+		io.WriteString(writer, "chunk")
+		writer.(http.Flusher).Flush()
+	})
+	p.Wrap(next).ServeHTTP(w, r)
+	if !w.Flushed || w.Body.String() != "chunk" || w.Header().Get("Access-Control-Allow-Origin") != "https://admin.example" || len(w.Header().Values("Vary")) != 1 {
+		t.Fatal(w)
+	}
+	for _, prior := range []string{"*", "Accept-Encoding, Origin"} {
+		h := http.Header{"Vary": {prior}}
+		vary(h, "Origin")
+		if !reflect.DeepEqual(h.Values("Vary"), []string{prior}) {
+			t.Fatal(h)
+		}
+	}
+	disabled, _ := New(Config{})
+	if reflect.ValueOf(disabled.Wrap(next)).Pointer() != reflect.ValueOf(next).Pointer() {
+		t.Fatal("disabled policy not passthrough")
+	}
+	var wg sync.WaitGroup
+	h := p.Wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(200) }))
+	for i := 0; i < 32; i++ {
+		wg.Add(1)
+		go func(i int) {
+			defer wg.Done()
+			for j := 0; j < 100; j++ {
+				r := httptest.NewRequest("GET", "/", nil)
+				origin := "https://admin.example"
+				if i%2 == 1 {
+					origin = "https://merchant.example"
+				}
+				r.Header.Set("Origin", origin)
+				w := httptest.NewRecorder()
+				h.ServeHTTP(w, r)
+				if w.Header().Get("Access-Control-Allow-Origin") != origin {
+					t.Error("cross-request origin leak")
+				}
+			}
+		}(i)
+	}
+	wg.Wait()
+}
+
+func FuzzCORSHeaders(f *testing.F) {
+	f.Add("https://admin.example", "POST", "authorization, content-type")
+	f.Add("https://admin.example.evil", "POST", "")
+	f.Add("null", "GET", "\r\n")
+	p, _ := New(exampleConfig())
+	h := p.Wrap(http.HandlerFunc(func(http.ResponseWriter, *http.Request) { panic("preflight reached business") }))
+	f.Fuzz(func(t *testing.T, origin, method, headers string) {
+		r := httptest.NewRequest("OPTIONS", "/", nil)
+		r.Header.Set("Origin", origin)
+		r.Header.Set("Access-Control-Request-Method", method)
+		if headers != "" {
+			r.Header.Set("Access-Control-Request-Headers", headers)
+		}
+		w := httptest.NewRecorder()
+		h.ServeHTTP(w, r)
+		if w.Code != 204 && w.Code != 403 {
+			t.Fatal(w.Code)
+		}
+		if w.Body.Len() != 0 {
+			t.Fatal("unexpected body")
+		}
+		if value := w.Header().Get("Access-Control-Allow-Origin"); value != "" {
+			if value != "https://admin.example" && value != "https://merchant.example" {
+				t.Fatal("untrusted reflection")
+			}
+		}
+	})
+}
+
+type benchmarkWriter struct{ header http.Header }
+
+func (w benchmarkWriter) Header() http.Header         { return w.header }
+func (w benchmarkWriter) Write(p []byte) (int, error) { return len(p), nil }
+func (w benchmarkWriter) WriteHeader(int)             {}
+func BenchmarkCORS(b *testing.B) {
+	for _, mode := range []string{"disabled", "noOrigin", "allowed", "denied", "preflight", "wildcard"} {
+		b.Run(mode, func(b *testing.B) {
+			c := exampleConfig()
+			if mode == "disabled" {
+				c.Enabled = false
+			}
+			if mode == "wildcard" {
+				c.AllowedOrigins = []string{"*"}
+			}
+			p, _ := New(c)
+			h := p.Wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(200) }))
+			r := httptest.NewRequest("GET", "/", nil)
+			r.Header.Set("Origin", "https://admin.example")
+			if mode == "noOrigin" {
+				r.Header.Del("Origin")
+			}
+			if mode == "denied" {
+				r.Header.Set("Origin", "https://other.example")
+			}
+			if mode == "preflight" {
+				r.Method = "OPTIONS"
+				r.Header.Set("Access-Control-Request-Method", "POST")
+				r.Header.Set("Access-Control-Request-Headers", "authorization, content-type")
+			}
+			w := benchmarkWriter{make(http.Header)}
+			b.ReportAllocs()
+			b.ResetTimer()
+			for i := 0; i < b.N; i++ {
+				clear(w.header)
+				h.ServeHTTP(w, r)
+			}
+		})
+	}
+}
--- a/database/README.md
+++ b/database/README.md
@@ -6,7 +6,7 @@

 `database` 包提供基于标准库 `database/sql` 的连接池生命周期，不绑定 ORM 或驱动：

- `Config` / `ConfigFromEnv`：连接池参数和 `GO_OMNI_DB_*` 环境变量。
+- `Config`：驱动、DSN 与连接池参数；嵌入项目配置，通过文件显式引用变量。
 - `Open` / `OpenConnector`：通过 DSN 或标准 Connector 创建连接池、设置连接上限并在返回前执行 `PingContext`。
 - `Health`：用于就绪检查，等待连接和 Ping 均受 `PingTimeout` 限制。
 - `InTx`：统一事务提交和回滚；工作函数返回错误或 panic 时回滚。
@@ -17,11 +17,12 @@
 ```go
 import (
 	"context"
+    "git.yuntuo.hk/k2safe/go-omni/config"
 	_ "github.com/go-sql-driver/mysql"
 	"git.yuntuo.hk/k2safe/go-omni/database"
 )

-cfg, err := database.ConfigFromEnv("GO_OMNI_DB_")
+cfg, err := config.LoadProject("etc/database.yaml", database.DefaultConfig())
 if err != nil {
 	return err
 }
@@ -32,19 +33,15 @@ if err != nil {
 defer db.Close()
 ```

-连接池相关环境变量：
+对应文件（框架不规定变量名）：

-```text
-GO_OMNI_DB_DRIVER=mysql
-GO_OMNI_DB_DSN=user:password@tcp(127.0.0.1:3306)/app?parseTime=true
-GO_OMNI_DB_MAX_OPEN_CONNS=10
-GO_OMNI_DB_MAX_IDLE_CONNS=5
-GO_OMNI_DB_CONN_MAX_LIFETIME=30m
-GO_OMNI_DB_CONN_MAX_IDLE_TIME=5m
-GO_OMNI_DB_PING_TIMEOUT=5s
+```yaml
+driver: mysql
+dsn: "${DB_DSN}"
+maxOpenConns: "${DB_MAX_OPEN:-10}"
 ```

-使用 `ConfigFromEnv` / `Open` 时 `DSN` 必填，环境变量入口的驱动默认是 `mysql`。数据库建库、迁移、表结构和具体 Repository 属于业务项目或可选模块，不会被核心包自动执行。
+Open 使用的 Driver、DSN 必填。建库、迁移、表结构和业务 Repository 由项目负责。v0.22 删除 ConfigFromEnv/ApplyEnv；不再隐式扫描数据库变量。

 `MaxIdleConns=0` 会禁用空闲连接。初始化 Ping 失败会关闭已创建的连接池。

@@ -62,12 +59,9 @@ python3 scripts/verifyDatabase.py --version v0.2.0
 结束时清理容器、匿名数据卷和临时项目。常规 `go test ./...` 不依赖 Docker。


-## 项目配置叠加
+## 项目配置

-`database.ApplyEnv(cfg, prefix)` 在已有文件/默认配置上覆盖非空环境变量，保留未覆盖的池参数。
-`Config` 的 JSON/YAML 字段使用 lowerCamelCase，`DSN` 使用 `json:"-"`，连接密钥从环境变量加载。
-API 脚手架 `--database mysql` 使用此流程，并要求正的 `maxOpenConns`，提供数据库 readiness 与幂等清理。
-具体表结构、迁移和 Repository 留在业务项目，参考 `examples/userService`。
+配置结构作为项目 Config 的字段，Default() 初始化连接池，文件按需覆盖。DSN 可使用 `dsn: "${DB_DSN}"`；database.Config 的 JSON 序列化不输出 DSN 原值。不要打印原始配置对象。当前 API 脚手架使用结构化 MySQL 适配器，由 svc 统一初始化与关闭。

 ## Connector 接入（v0.9.1-preview）

@@ -103,7 +97,7 @@ func Open(ctx context.Context, address, user, password, name string,
 }
 ```

-调用时以 `database.DefaultPoolConfig()` 为起点，按项目需要调整。已有 `database.Config` 可调用 `.PoolConfig()` 提取池设置；`ConfigFromEnv` / `ApplyEnv` 仍是 DSN 入口，不用为 Connector 填假 DSN。`PoolConfig` 支持通过 `config.DecodeFile` 加载项目的 JSON/YAML 嵌套配置，环境覆盖由项目按自己的驱动配置组织。
+调用时以 `database.DefaultPoolConfig()` 为起点，按项目需要调整。已有 `database.Config` 可调用 `.PoolConfig()` 提取池设置；Connector 不需要填写 DSN。`PoolConfig` 支持通过 `config.DecodeFile` 加载项目的 JSON/YAML 嵌套配置，环境引用由项目在文件里显式声明。

 | PoolConfig 字段 | 默认值 / 含义 |
 | --- | --- |
--- a/database/configOverlay_test.go
+++ b/database/configOverlay_test.go
@@ -2,19 +2,27 @@ package database

 import (
 	"encoding/json"
+	"git.yuntuo.hk/k2safe/go-omni/config"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 	"time"
 )

-func TestApplyEnvPreservesFilePoolAndHidesDSN(t *testing.T) {
+func TestExplicitConfigPreservesPoolAndHidesDSN(t *testing.T) {
 	cfg := DefaultConfig()
+	cfg.Driver = "mysql"
+	path := filepath.Join(t.TempDir(), "db.yaml")
+	if err := os.WriteFile(path, []byte("dsn: \"${OMNI_TEST_DSN}\"\nmaxIdleConns: \"${OMNI_TEST_MAX_IDLE_CONNS}\"\nmaxOpenConns: \"${OMNI_TEST_MAX_OPEN_CONNS:-3}\""), 0600); err != nil {
+		t.Fatal(err)
+	}
 	cfg.MaxOpenConns = 3
 	cfg.MaxIdleConns = 1
 	cfg.PingTimeout = time.Second
 	t.Setenv("OMNI_TEST_DSN", "user:secret@tcp(localhost:3306)/test")
 	t.Setenv("OMNI_TEST_MAX_IDLE_CONNS", "0")
-	got, err := ApplyEnv(cfg, "OMNI_TEST_")
+	got, err := config.LoadProject(path, cfg)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -29,7 +37,7 @@ func TestApplyEnvPreservesFilePoolAndHidesDSN(t *testing.T) {
 		t.Fatalf("unsafe config encoding: %s", data)
 	}
 	t.Setenv("OMNI_TEST_MAX_OPEN_CONNS", "bad")
-	if _, err = ApplyEnv(cfg, "OMNI_TEST_"); err == nil {
+	if _, err = config.LoadProject(path, cfg); err == nil {
 		t.Fatal("invalid override accepted")
 	}
 }
--- a/database/connector.go
+++ b/database/connector.go
@@ -7,6 +7,8 @@ import (
 	"errors"
 	"reflect"
 	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/internal/configdiag"
 )

 // PoolConfig contains only driver-independent settings. Connection credentials,
@@ -25,15 +27,29 @@ func DefaultPoolConfig() PoolConfig {
 }

 func (c PoolConfig) Validate() error {
-	if c.MaxOpenConns < 0 || c.MaxIdleConns < 0 {
-		return errors.New("database pool limits cannot be negative")
+	for _, f := range []struct {
+		name  string
+		value int
+	}{{"maxOpenConns", c.MaxOpenConns}, {"maxIdleConns", c.MaxIdleConns}} {
+		if f.value < 0 {
+			return configdiag.New(f.name, "must be nonnegative")
+		}
 	}
 	if c.MaxOpenConns > 0 && c.MaxIdleConns > c.MaxOpenConns {
-		return errors.New("max idle connections cannot exceed max open connections")
+		return configdiag.New("maxIdleConns", "must not exceed maxOpenConns")
 	}
-	if c.ConnMaxLifetime < 0 || c.ConnMaxIdleTime < 0 || c.PingTimeout <= 0 {
-		return errors.New("database timeouts are invalid")
+	for _, f := range []struct {
+		name  string
+		value time.Duration
+	}{{"connMaxLifetime", c.ConnMaxLifetime}, {"connMaxIdleTime", c.ConnMaxIdleTime}} {
+		if f.value < 0 {
+			return configdiag.New(f.name, "must be nonnegative")
+		}
 	}
+	if c.PingTimeout <= 0 {
+		return configdiag.New("pingTimeout", "must be positive")
+	}
+
 	return nil
 }

--- a/database/database.go
+++ b/database/database.go
@@ -5,17 +5,18 @@ package database
 import (
 	"context"
 	"database/sql"
+	"encoding/json"
 	"errors"
 	"fmt"
-	"os"
-	"strconv"
 	"strings"
 	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/internal/configdiag"
 )

 type Config struct {
 	Driver          string        `json:"driver"`
-	DSN             string        `json:"-"`
+	DSN             string        `json:"dsn"`
 	MaxOpenConns    int           `json:"maxOpenConns"`
 	MaxIdleConns    int           `json:"maxIdleConns"`
 	ConnMaxLifetime time.Duration `json:"connMaxLifetime"`
@@ -23,6 +24,14 @@ type Config struct {
 	PingTimeout     time.Duration `json:"pingTimeout"`
 }

+// MarshalJSON omits the connection credential from serialized diagnostics.
+func (c Config) MarshalJSON() ([]byte, error) {
+	type plain Config
+	safe := plain(c)
+	safe.DSN = ""
+	return json.Marshal(safe)
+}
+
 func DefaultConfig() Config { return DefaultPoolConfig().config() }

 // PoolConfig returns driver-independent connection pool settings.
@@ -34,55 +43,12 @@ func (c Config) PoolConfig() PoolConfig {
 	}
 }

-// ConfigFromEnv reads GO_OMNI_DB_* style settings. DSN is required.
-func ConfigFromEnv(prefix string) (Config, error) {
-	return ApplyEnv(DefaultConfig(), prefix)
-}
-
-// ApplyEnv overlays nonempty environment settings on file/default configuration.
-// DSN is environment-only when Config is decoded from JSON or YAML.
-func ApplyEnv(cfg Config, prefix string) (Config, error) {
-	prefix = strings.TrimSpace(prefix)
-	if prefix == "" {
-		prefix = "GO_OMNI_DB_"
-	}
-	if value := strings.TrimSpace(os.Getenv(prefix + "DRIVER")); value != "" {
-		cfg.Driver = value
-	}
-	if cfg.Driver == "" {
-		cfg.Driver = "mysql"
-	}
-	if value := strings.TrimSpace(os.Getenv(prefix + "DSN")); value != "" {
-		cfg.DSN = value
-	}
-	if cfg.DSN == "" {
-		return Config{}, fmt.Errorf("%sDSN is required", prefix)
-	}
-	var err error
-	if cfg.MaxOpenConns, err = envInt(prefix+"MAX_OPEN_CONNS", cfg.MaxOpenConns); err != nil {
-		return Config{}, err
-	}
-	if cfg.MaxIdleConns, err = envInt(prefix+"MAX_IDLE_CONNS", cfg.MaxIdleConns); err != nil {
-		return Config{}, err
-	}
-	if cfg.ConnMaxLifetime, err = envDuration(prefix+"CONN_MAX_LIFETIME", cfg.ConnMaxLifetime); err != nil {
-		return Config{}, err
-	}
-	if cfg.ConnMaxIdleTime, err = envDuration(prefix+"CONN_MAX_IDLE_TIME", cfg.ConnMaxIdleTime); err != nil {
-		return Config{}, err
-	}
-	if cfg.PingTimeout, err = envDuration(prefix+"PING_TIMEOUT", cfg.PingTimeout); err != nil {
-		return Config{}, err
-	}
-	return cfg, cfg.Validate()
-}
-
 func (c Config) Validate() error {
 	if strings.TrimSpace(c.Driver) == "" {
-		return errors.New("database driver is required")
+		return configdiag.New("driver", "is required")
 	}
 	if strings.TrimSpace(c.DSN) == "" {
-		return errors.New("database DSN is required")
+		return configdiag.New("dsn", "is required")
 	}
 	return c.PoolConfig().Validate()
 }
@@ -165,27 +131,3 @@ func (db *DB) InTx(ctx context.Context, options *sql.TxOptions, work func(*sql.T
 	}
 	return nil
 }
-
-func envInt(key string, fallback int) (int, error) {
-	value := strings.TrimSpace(os.Getenv(key))
-	if value == "" {
-		return fallback, nil
-	}
-	parsed, err := strconv.Atoi(value)
-	if err != nil {
-		return 0, fmt.Errorf("%s must be an integer: %w", key, err)
-	}
-	return parsed, nil
-}
-
-func envDuration(key string, fallback time.Duration) (time.Duration, error) {
-	value := strings.TrimSpace(os.Getenv(key))
-	if value == "" {
-		return fallback, nil
-	}
-	parsed, err := time.ParseDuration(value)
-	if err != nil {
-		return 0, fmt.Errorf("%s must be a duration: %w", key, err)
-	}
-	return parsed, nil
-}
--- a/database/database_test.go
+++ b/database/database_test.go
@@ -2,54 +2,10 @@ package database

 import (
 	"context"
-	"os"
 	"strings"
 	"testing"
-	"time"
 )

-func TestConfigFromEnv(t *testing.T) {
-	keys := []string{
-		"GO_OMNI_DB_DRIVER", "GO_OMNI_DB_DSN", "GO_OMNI_DB_MAX_OPEN_CONNS",
-		"GO_OMNI_DB_MAX_IDLE_CONNS", "GO_OMNI_DB_CONN_MAX_LIFETIME",
-		"GO_OMNI_DB_CONN_MAX_IDLE_TIME", "GO_OMNI_DB_PING_TIMEOUT",
-	}
-	for _, key := range keys {
-		t.Setenv(key, "")
-		_ = os.Unsetenv(key)
-	}
-	t.Setenv("GO_OMNI_DB_DSN", "root:secret@tcp(127.0.0.1:3306)/demo")
-	t.Setenv("GO_OMNI_DB_MAX_OPEN_CONNS", "20")
-	t.Setenv("GO_OMNI_DB_MAX_IDLE_CONNS", "8")
-	t.Setenv("GO_OMNI_DB_CONN_MAX_LIFETIME", "2m")
-	t.Setenv("GO_OMNI_DB_PING_TIMEOUT", "750ms")
-	cfg, err := ConfigFromEnv("")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if cfg.Driver != "mysql" || cfg.DSN == "" || cfg.MaxOpenConns != 20 || cfg.MaxIdleConns != 8 || cfg.ConnMaxLifetime != 2*time.Minute || cfg.PingTimeout != 750*time.Millisecond {
-		t.Fatalf("unexpected config: %+v", cfg)
-	}
-}
-
-func TestConfigFromEnvRejectsInvalidValues(t *testing.T) {
-	t.Setenv("GO_OMNI_DB_DSN", "demo")
-	t.Setenv("GO_OMNI_DB_MAX_OPEN_CONNS", "bad")
-	if _, err := ConfigFromEnv(""); err == nil || !strings.Contains(err.Error(), "MAX_OPEN_CONNS") {
-		t.Fatalf("expected invalid pool limit error, got %v", err)
-	}
-	t.Setenv("GO_OMNI_DB_MAX_OPEN_CONNS", "2")
-	t.Setenv("GO_OMNI_DB_MAX_IDLE_CONNS", "3")
-	if _, err := ConfigFromEnv(""); err == nil || !strings.Contains(err.Error(), "max idle") {
-		t.Fatalf("expected pool relationship error, got %v", err)
-	}
-	t.Setenv("GO_OMNI_DB_MAX_IDLE_CONNS", "1")
-	t.Setenv("GO_OMNI_DB_PING_TIMEOUT", "0s")
-	if _, err := ConfigFromEnv(""); err == nil || !strings.Contains(err.Error(), "timeouts") {
-		t.Fatalf("expected timeout error, got %v", err)
-	}
-}
-
 func TestOpenValidatesBeforeLoadingDriver(t *testing.T) {
 	_, err := Open(context.Background(), Config{Driver: "", DSN: "demo"})
 	if err == nil || !strings.Contains(err.Error(), "driver") {
--- a/database/mysql/README.md
+++ b/database/mysql/README.md
@@ -10,13 +10,14 @@
 go-omni new --database mysql --module example.com/billing ./billing
 ```

-`etc/config.yaml` 使用结构化配置，环境覆盖优先：
+`etc/config.yaml` 使用结构化配置；需要环境变量时在字段值明确写引用，固定值不被覆盖：

 ```yaml
 database:
  host: db.example.com
  port: 3306
  user: app
+  password: "${DB_PASSWORD}"
  database: billing
  parseTime: true
  location: UTC
@@ -37,7 +38,7 @@ database:
    pingTimeout: 5s
 ```

-通过 `GO_OMNI_DB_PASSWORD` 传密码；还有 HOST、PORT、USER、DATABASE、TLS_CA_FILE、TLS_CERT_FILE、TLS_KEY_FILE、POOL_MAX_OPEN_CONNS 等。业务也可自定义 env 标签。新生成服务不再读取 DSN；独立数据库迁移 CLI 和手写 `database.Open/OpenConnector` 的原接口保留。
+示例通过文件里的 `${DB_PASSWORD}` 读取密码；HOST、PORT、TLS 和池参数同样按需在文件写引用，不自动扫描变量、不使用 env 标签。新生成服务使用结构化连接参数；独立迁移 CLI 的显式 DSN 参数及 Open/OpenConnector 接口保留。

 默认启用 TLS 并校验系统信任链与主机名；私有 CA 用 caFile，双向 TLS 额外设置 certFile/keyFile。只有明确设置 `tls.mode: disabled` 才使用明文。Unix socket 用 socket，若在 socket 上使用 TLS，必须提供 serverName。不会注册全局 TLS 配置或全局驱动 Logger。

@@ -69,3 +70,7 @@ func (c *ServiceContext) DatabaseOptions() []mysqladapter.Option {
 `WithDriverConfig(func(*mysql.Config) error)` 支持高级拨号、驱动参数等，配置在回调后克隆；这是项目明确选择的底层扩展。`NewConnector` 返回标准 driver.Connector，供已有基础设施使用；它不接受启动检查选项。任意驱动仍可用核心 `database.OpenConnector`。

 错误有安全摘要，errors.Is/As 保留 TLS/驱动/项目检查的原因。配置验证不读证书、不连接数据库；Open 才读取证书、创建池并握手。不要自行打印原始配置或展开可能包含内部信息的 driver 字段给用户。
+
+## 字段级配置错误
+
+Validate 返回独立字段与安全原因，例如 port（1–65535）、readTimeout、pool.maxIdleConns、tls.keyFile。项目调用 `config.AtField("database", err)` 后，统一加载器补齐 database 前缀、文件、环境名和行列，无需重复写端口/连接池校验。TLS 成对配置会指出缺失的那个字段。连接失败、驱动和证书文件的内部原因仍通过 errors.Is/As 保留，不把凭据放进公开提示。见 [配置诊断](../../CONFIG.md#框架模块的字段诊断)。
--- a/database/mysql/mysql.go
+++ b/database/mysql/mysql.go
@@ -19,6 +19,7 @@ import (
 	"time"

 	"git.yuntuo.hk/k2safe/go-omni/database"
+	"git.yuntuo.hk/k2safe/go-omni/internal/configdiag"
 	"git.yuntuo.hk/k2safe/go-omni/logx"
 	mysqldriver "github.com/go-sql-driver/mysql"
 )
@@ -28,7 +29,7 @@ type Config struct {
 	Port      int    `json:"port"`
 	Socket    string `json:"socket"`
 	User      string `json:"user"`
-	Password  string `json:"password" env:",secret"`
+	Password  string `json:"password"`
 	Database  string `json:"database"`
 	ParseTime bool   `json:"parseTime"`
 	Location  string `json:"location"`
@@ -61,45 +62,60 @@ var identifier = regexp.MustCompile(`^[A-Za-z_][A-Za-z0-9_]*$`)
 // Validate does not read certificate files or open connections. All defaults
 // come from DefaultConfig; explicit zero I/O timeouts mean no driver deadline.
 func (c Config) Validate() error {
-	if c.Socket == "" && (c.Host == "" || strings.ContainsAny(c.Host, "/\r\n\t ") || c.Port < 1 || c.Port > 65535) {
-		return errors.New("mysql: invalid host or port")
+	if c.Socket == "" {
+		if c.Host == "" || strings.ContainsAny(c.Host, "/\r\n\t ") {
+			return configdiag.New("host", "must be a nonempty hostname or IP address")
+		}
+		if c.Port < 1 || c.Port > 65535 {
+			return configdiag.New("port", "must be between 1 and 65535")
+		}
 	}
-	if strings.ContainsRune(c.Socket, 0) || strings.ContainsRune(c.Database, 0) || strings.ContainsRune(c.User, 0) {
-		return errors.New("mysql: invalid connection field")
+	for _, f := range []struct{ name, value string }{{"socket", c.Socket}, {"database", c.Database}, {"user", c.User}} {
+		if strings.ContainsRune(f.value, 0) {
+			return configdiag.New(f.name, "must not contain a NUL character")
+		}
 	}
-	if c.ConnectTimeout < 0 || c.ReadTimeout < 0 || c.WriteTimeout < 0 {
-		return errors.New("mysql: timeouts cannot be negative")
+	for _, f := range []struct {
+		name  string
+		value time.Duration
+	}{{"connectTimeout", c.ConnectTimeout}, {"readTimeout", c.ReadTimeout}, {"writeTimeout", c.WriteTimeout}} {
+		if f.value < 0 {
+			return configdiag.New(f.name, "must be nonnegative")
+		}
 	}
 	if err := c.Pool.Validate(); err != nil {
-		return err
+		return configdiag.At("pool", err)
 	}
 	if c.Location != "" {
 		if _, err := time.LoadLocation(c.Location); err != nil {
-			return errors.New("mysql: invalid time location")
+			return configdiag.Wrap("location", "must be an available IANA time zone or UTC", err)
 		}
 	}
 	if c.Charset != "" && !identifier.MatchString(c.Charset) {
-		return errors.New("mysql: invalid charset")
+		return configdiag.New("charset", "must be a valid MySQL identifier")
 	}
 	if c.Collation != "" && !identifier.MatchString(c.Collation) {
-		return errors.New("mysql: invalid collation")
+		return configdiag.New("collation", "must be a valid MySQL identifier")
 	}
 	for key := range c.Session {
 		if !identifier.MatchString(key) {
-			return errors.New("mysql: invalid session variable name")
+			return configdiag.New("session", "keys must be valid MySQL identifiers")
 		}
 	}
 	if c.TLS.Mode != "" && c.TLS.Mode != "required" && c.TLS.Mode != "disabled" {
-		return errors.New("mysql: TLS mode must be required or disabled")
+		return configdiag.New("tls.mode", "must be required or disabled")
 	}
 	if (c.TLS.CertFile == "") != (c.TLS.KeyFile == "") {
-		return errors.New("mysql: TLS client certificate and key must be configured together")
+		if c.TLS.CertFile == "" {
+			return configdiag.New("tls.certFile", "is required when keyFile is configured")
+		}
+		return configdiag.New("tls.keyFile", "is required when certFile is configured")
 	}
 	if c.TLS.Mode == "disabled" && (c.TLS.CAFile != "" || c.TLS.CertFile != "" || c.TLS.ServerName != "") {
-		return errors.New("mysql: TLS fields cannot be used when disabled")
+		return configdiag.New("tls.mode", "must be required when TLS fields are configured")
 	}
 	if c.Socket != "" && c.TLS.Mode != "disabled" && c.TLS.ServerName == "" {
-		return errors.New("mysql: TLS over a unix socket requires serverName")
+		return configdiag.New("tls.serverName", "is required for TLS over a unix socket")
 	}
 	return nil
 }
--- a/examples/configuration/README.md
+++ b/examples/configuration/README.md
@@ -0,0 +1,23 @@
+# 统一配置加载示例
+
+从框架根目录运行，无需数据库或外部服务：
+
+```sh
+go run ./examples/configuration
+go run ./examples/configuration -format json
+go run ./examples/configuration -format xml
+DEMO_CLIENT_TIMEOUT=500ms DEMO_MAX_ITEMS=0 go run ./examples/configuration
+DEMO_MAX_ITEMS=wrong go run ./examples/configuration
+```
+
+前三次都输出 `timeout=2s maxItems=100 allowed=[json xml]`。文件显式引用允许零值。
+最后一条输出定位 `maxItems` / `DEMO_MAX_ITEMS` 的安全错误，不打印输入原值。
+也可 `-config /path/to/app.yaml` 读取自己的文件。示例没有建立网络连接。
+
+`Config` 定义字段，`Default()` 定义初始值，`Validate` 用 `config.Invalid` 返回字段与公开原因。
+文件中的 `${NAME}` 必填，`${NAME:-value}` 支持空/未设置的备用值，`$${NAME}` 保留字面量；字符串不裁剪，也不二次展开。没有出现在文件引用中的变量不会被读取。
+
+`newLoader` 额外注册 `.custom`（演示复用 JSON decoder）；同一个 `load` 可读取所有格式。
+JSON/YAML/XML 直接可用，无需注册。新增格式只修改解析器注册，不改业务结构或校验。
+
+只打印选定非敏感字段，不输出整个配置。完整格式、错误定位和旧项目迁移见 [CONFIG.md](../../CONFIG.md)。
--- a/examples/configuration/config.json
+++ b/examples/configuration/config.json
@@ -0,0 +1 @@
+{"client":{"endpoint":"https://${DEMO_HOST:-example.com}","timeout":"${DEMO_CLIENT_TIMEOUT:-2s}","token":"${DEMO_CLIENT_TOKEN:-}"},"maxItems":"${DEMO_MAX_ITEMS:-100}","allowed":["json","xml"]}
--- a/examples/configuration/config.xml
+++ b/examples/configuration/config.xml
@@ -0,0 +1 @@
+<config><client><endpoint>https://${DEMO_HOST:-example.com}</endpoint><timeout>${DEMO_CLIENT_TIMEOUT:-2s}</timeout><token>${DEMO_CLIENT_TOKEN:-}</token></client><maxItems>${DEMO_MAX_ITEMS:-100}</maxItems><allowed type="array"><item>json</item><item>xml</item></allowed></config>
--- a/examples/configuration/config.yaml
+++ b/examples/configuration/config.yaml
@@ -0,0 +1,6 @@
+client:
+  endpoint: "https://${DEMO_HOST:-example.com}"
+  timeout: "${DEMO_CLIENT_TIMEOUT:-2s}"
+  token: "${DEMO_CLIENT_TOKEN:-}"
+maxItems: "${DEMO_MAX_ITEMS:-100}"
+allowed: [json, xml]
--- a/examples/configuration/main.go
+++ b/examples/configuration/main.go
@@ -0,0 +1,87 @@
+// Run with go run ./examples/configuration -format xml, or -config /path/to/app.yaml.
+package main
+
+import (
+	"embed"
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/config"
+)
+
+//go:embed config.json config.yaml config.xml
+var examples embed.FS
+
+type ClientConfig struct {
+	Endpoint string        `json:"endpoint"`
+	Timeout  time.Duration `json:"timeout"`
+	// The file chooses a fixed value or an explicit environment reference.
+	Token string `json:"token"`
+}
+type Config struct {
+	Client   ClientConfig `json:"client"`
+	MaxItems int          `json:"maxItems"`
+	Allowed  []string     `json:"allowed"`
+}
+
+func Default() Config { return Config{Client: ClientConfig{Timeout: 3 * time.Second}, MaxItems: 20} }
+
+func (c Config) Validate() error {
+	if c.Client.Timeout <= 0 {
+		return config.Invalid("client.timeout", "must be positive")
+	}
+	if c.MaxItems < 0 {
+		return config.Invalid("maxItems", "must not be negative")
+	}
+	return nil
+}
+func newLoader() (*config.Loader, error) {
+	// Example of an instance-local extension. A TOML/etc. adapter can implement
+	// Decoder and return Document using that parser instead; no global registry.
+	return config.NewLoader(config.WithDecoder("custom", config.DecoderFunc(func(data []byte) (config.Document, error) {
+		return (config.JSONDecoder{}).Decode(data)
+	})))
+}
+func load(path string) (Config, error) {
+	loader, err := newLoader()
+	if err != nil {
+		return Config{}, err
+	}
+	return config.LoadProject(path, Default(), loader)
+}
+func run() error {
+	path := flag.String("config", "", "external configuration file")
+	format := flag.String("format", "yaml", "embedded example: json, yaml, xml")
+	flag.Parse()
+	if *path == "" {
+		data, err := examples.ReadFile("config." + *format)
+		if err != nil {
+			return fmt.Errorf("choose json, yaml or xml")
+		}
+		dir, err := os.MkdirTemp("", "goOmniConfiguration-")
+		if err != nil {
+			return err
+		}
+		defer os.RemoveAll(dir)
+		*path = filepath.Join(dir, "config."+*format)
+		if err = os.WriteFile(*path, data, 0600); err != nil {
+			return err
+		}
+	}
+	cfg, err := load(*path)
+	if err != nil {
+		return err
+	}
+	// Print selected non-sensitive fields, never the whole configuration.
+	fmt.Printf("timeout=%s maxItems=%d allowed=%v\n", cfg.Client.Timeout, cfg.MaxItems, cfg.Allowed)
+	return nil
+}
+func main() {
+	if err := run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
--- a/examples/configuration/main_test.go
+++ b/examples/configuration/main_test.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+func TestExamples(t *testing.T) {
+	var previous Config
+	for i, ext := range []string{"json", "yaml", "xml", "custom"} {
+		source := ext
+		if source == "custom" {
+			source = "json"
+		}
+		data, err := examples.ReadFile("config." + source)
+		if err != nil {
+			t.Fatal(err)
+		}
+		path := filepath.Join(t.TempDir(), "app."+ext)
+		if err = os.WriteFile(path, data, 0600); err != nil {
+			t.Fatal(err)
+		}
+		got, err := load(path)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if i > 0 && !reflect.DeepEqual(previous, got) {
+			t.Fatal("format difference")
+		}
+		previous = got
+	}
+}
--- a/examples/cors/README.md
+++ b/examples/cors/README.md
@@ -0,0 +1,17 @@
+# CORS 与正常鉴权
+
+在框架根目录运行：
+
+```sh
+go run ./examples/cors
+WEB_ORIGIN=https://admin.example go run ./examples/cors
+```
+
+仅监听临时 localhost 端口，不依赖数据库或外部服务。配置由统一 LoadProject 加载，示例模拟浏览器 Origin/预检请求头，依次检查：
+
+- OPTIONS 预检返回 204，无需登录。
+- 实际 GET 未登录仍返回 401，前端可读取这条错误响应。
+- 示例凭据通过后返回 200。
+- 404 也保留允许来源的 CORS 响应头。
+
+示例 Token 仅用于展示，项目使用自身鉴权实现。CORS 不验证 Token，也不保证其他客户端不能调用 API。完整规则与配置见 [cors](../../cors/README.md)。
--- a/examples/cors/config.yaml
+++ b/examples/cors/config.yaml
@@ -0,0 +1,10 @@
+server:
+  cors:
+    enabled: true
+    allowedOrigins:
+      - "${WEB_ORIGIN:-https://web.example}"
+    allowedMethods: [GET, POST]
+    allowedHeaders: [Authorization, Content-Type]
+    exposedHeaders: [X-Request-ID]
+    allowCredentials: false
+    maxAge: 10m
--- a/examples/cors/main.go
+++ b/examples/cors/main.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"time"
+
+	omni "git.yuntuo.hk/k2safe/go-omni"
+	"git.yuntuo.hk/k2safe/go-omni/config"
+)
+
+type Config struct {
+	Server config.Config `json:"server"`
+}
+
+func (c Config) Validate() error { return config.AtField("server", c.Server.Validate()) }
+
+func run(path string) error {
+	cfg, err := config.LoadProject(path, Config{Server: config.Default()})
+	if err != nil {
+		return err
+	}
+	a := omni.New(omni.WithConfig(cfg.Server))
+	defer a.Close()
+	a.GET("/private", func(c *omni.Context) error {
+		if c.Header("Authorization") != "Bearer example-only" {
+			return omni.Unauthorized("LOGIN_REQUIRED", "login required")
+		}
+		return c.OK("authenticated")
+	})
+	server := httptest.NewServer(a)
+	defer server.Close()
+	client := &http.Client{Timeout: 3 * time.Second}
+	defer client.CloseIdleConnections()
+	for _, tc := range []struct {
+		method, path, auth string
+		status             int
+	}{{"OPTIONS", "/private", "", 204}, {"GET", "/private", "", 401}, {"GET", "/private", "Bearer example-only", 200}, {"GET", "/missing", "", 404}} {
+		r, _ := http.NewRequest(tc.method, server.URL+tc.path, nil)
+		r.Header.Set("Origin", cfg.Server.CORS.AllowedOrigins[0])
+		if tc.method == "OPTIONS" {
+			r.Header.Set("Access-Control-Request-Method", "GET")
+			r.Header.Set("Access-Control-Request-Headers", "authorization")
+		}
+		if tc.auth != "" {
+			r.Header.Set("Authorization", tc.auth)
+		}
+		res, err := client.Do(r)
+		if err != nil {
+			return err
+		}
+		_, readErr := io.Copy(io.Discard, res.Body)
+		closeErr := res.Body.Close()
+		if err := errors.Join(readErr, closeErr); err != nil {
+			return err
+		}
+		if res.StatusCode != tc.status || res.Header.Get("Access-Control-Allow-Origin") == "" {
+			return fmt.Errorf("unexpected CORS response: %d", res.StatusCode)
+		}
+		fmt.Printf("%s %s -> %d, CORS allowed\n", tc.method, tc.path, res.StatusCode)
+	}
+	return nil
+}
+func main() {
+	path := flag.String("config", "examples/cors/config.yaml", "selected configuration file")
+	flag.Parse()
+	if err := run(*path); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
--- a/examples/developerTools/README.md
+++ b/examples/developerTools/README.md
@@ -0,0 +1,18 @@
+# 配置诊断、严格 HTTP 状态、类型预检和日志时区
+
+在框架根目录运行，不需要数据库、账号或外部服务。HTTP 示例只访问临时 localhost 服务：
+
+```sh
+go run ./examples/developerTools
+DEMO_LOG_TIME_ZONE=UTC go run ./examples/developerTools
+# 以下两条应非零退出，输出具体字段和环境变量名，不输出原值：
+DEMO_DB_PORT=70000 go run ./examples/developerTools
+DEMO_LOG_LEVEL=invalid go run ./examples/developerTools
+```
+
+- 配置只做校验，没有连接数据库。失败指向 `database.port` / `server.log.level`，并保留文件行列与变量名。
+- Logger 使用选定时区；只改变记录的时间戳，不修改全局 time.Local 和业务时间字段。
+- `copyx.Check[Input, Result]` 发现切片元素内的不兼容字段；加上显式 `strconv.Atoi` converter 后通过。预检不执行 converter，真实非法数字仍在 Copy 时返回错误。
+- JSON 调用显式 `WithSuccessStatuses(200)`，拒绝 201，框架仍负责关闭响应体。
+
+详见 [配置](../../CONFIG.md)、[日志](../../logx/README.md)、[HTTP 客户端](../../httpc/README.md)、[copyx](../../COPY.md)。
--- a/examples/developerTools/config.yaml
+++ b/examples/developerTools/config.yaml
@@ -0,0 +1,7 @@
+# Validates database settings without connecting in this demonstration.
+database:
+  port: "${DEMO_DB_PORT:-3306}"
+server:
+  log:
+    level: "${DEMO_LOG_LEVEL:-info}"
+    timeZone: "${DEMO_LOG_TIME_ZONE:-Asia/Shanghai}"
--- a/examples/developerTools/main.go
+++ b/examples/developerTools/main.go
@@ -0,0 +1,104 @@
+// Run from the framework root with: go run ./examples/developerTools
+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strconv"
+	_ "time/tzdata" // This example embeds zones; production builds can use -tags timetzdata.
+
+	"git.yuntuo.hk/k2safe/go-omni/config"
+	"git.yuntuo.hk/k2safe/go-omni/copyx"
+	mysql "git.yuntuo.hk/k2safe/go-omni/database/mysql"
+	"git.yuntuo.hk/k2safe/go-omni/httpc"
+	"git.yuntuo.hk/k2safe/go-omni/logx"
+)
+
+type Config struct {
+	Database mysql.Config  `json:"database"`
+	Server   config.Config `json:"server"`
+}
+
+func Default() Config {
+	c := config.Default()
+	c.Log.Output = "stdout"
+	return Config{Database: mysql.DefaultConfig(), Server: c}
+}
+func (c Config) Validate() error {
+	if err := c.Database.Validate(); err != nil {
+		return config.AtField("database", err)
+	}
+	return config.AtField("server", c.Server.Validate())
+}
+
+type Input struct{ Values []TextValue }
+type TextValue struct{ Number string }
+type Result struct{ Values []NumberValue }
+type NumberValue struct{ Number int }
+
+func run(path string) error {
+	cfg, err := config.LoadProject(path, Default())
+	if err != nil {
+		return err
+	}
+	// Validation only: this example never opens a database.
+	logger, err := logx.New(cfg.Server.Log)
+	if err != nil {
+		return err
+	}
+	defer logger.Close()
+	logger.InfoContext(context.Background(), "instance time zone", "configuredZone", cfg.Server.Log.TimeZone)
+	if err := copyx.Check[Input, Result](); !errors.Is(err, copyx.ErrType) {
+		return fmt.Errorf("expected a type mismatch, got %v", err)
+	}
+	// Explicit Go converter owns the number conversion; no JSON mapping file.
+	options := []copyx.Option{copyx.WithConverter(strconv.Atoi)}
+	if err := copyx.Check[Input, Result](options...); err != nil {
+		return err
+	}
+	var output Result
+	if err := copyx.Copy(&output, Input{Values: []TextValue{{Number: "42"}}}, options...); err != nil {
+		return err
+	}
+	fmt.Printf("type check and copy succeeded: %d\n", output.Values[0].Number)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/created" {
+			w.WriteHeader(http.StatusCreated)
+		}
+		io.WriteString(w, `{"value":"example"}`)
+	}))
+	defer server.Close()
+	client, err := httpc.New(httpc.Config{DisableLogging: true})
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+	var reply struct {
+		Value string `json:"value"`
+	}
+	if err := client.JSON(context.Background(), http.MethodGet, server.URL, nil, &reply, httpc.WithSuccessStatuses(http.StatusOK)); err != nil {
+		return err
+	}
+	err = client.JSON(context.Background(), http.MethodGet, server.URL+"/created", nil, &reply, httpc.WithSuccessStatuses(http.StatusOK))
+	var status *httpc.StatusError
+	if !errors.As(err, &status) || status.StatusCode != http.StatusCreated {
+		return fmt.Errorf("expected status rejection, got %v", err)
+	}
+	fmt.Println("strict JSON: 200 accepted, 201 rejected")
+	return nil
+}
+func main() {
+	path := flag.String("config", "examples/developerTools/config.yaml", "selected configuration file")
+	flag.Parse()
+	if err := run(*path); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
--- a/examples/httpClient/README.md
+++ b/examples/httpClient/README.md
@@ -0,0 +1,12 @@
+# HTTP Client 示例
+
+```sh
+go run ./examples/httpClient
+```
+
+只创建本机临时 HTTP 服务，不访问业务系统、数据库或公网；结束后关闭连接和监听器。
+示例创建并复用一个 Client，显式直连，配置连接池/阶段超时，通过 JSON 选项传入 Authorization 和 Accept，并按单次请求收紧响应上限。
+
+输出 `authenticated request succeeded`。示例 token 是固定演示字符串，实际项目从配置或请求上下文取得认证信息。
+
+完整参数、代理规则、流式调用、生命周期、重试边界和兼容说明见 [httpc](../../httpc/README.md)。
--- a/examples/httpClient/main.go
+++ b/examples/httpClient/main.go
@@ -0,0 +1,57 @@
+// Run with go run ./examples/httpClient. All HTTP traffic stays on loopback.
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/httpc"
+)
+
+type result struct {
+	Message string `json:"message"`
+}
+
+func run() error {
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("Authorization") != "Bearer example-token" {
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(result{Message: "authenticated request succeeded"})
+	}))
+	defer upstream.Close()
+	client, err := httpc.New(httpc.Config{
+		Proxy:   httpc.ProxyConfig{Mode: httpc.ProxyDirect},
+		Timeout: 3 * time.Second, DialTimeout: time.Second, TLSHandshakeTimeout: time.Second,
+		ResponseHeaderTimeout: time.Second, IdleConnTimeout: 30 * time.Second,
+		MaxConnsPerHost: 16, MaxIdleConnsPerHost: 8, MaxIdleConns: 32,
+		MaxResponseBytes: 1 << 20, DisableLogging: true,
+	})
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+	var output result
+	if err = client.JSON(context.Background(), http.MethodGet, upstream.URL, nil, &output,
+		httpc.WithHeader("Authorization", "Bearer example-token"),
+		httpc.WithHeaders(http.Header{"Accept": []string{"application/json"}}),
+		httpc.WithMaxResponseBytes(64<<10),
+	); err != nil {
+		return err
+	}
+	fmt.Println(output.Message)
+	return nil
+}
+func main() {
+	if err := run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
--- a/examples/httpClient/main_test.go
+++ b/examples/httpClient/main_test.go
@@ -0,0 +1,9 @@
+package main
+
+import "testing"
+
+func TestExample(t *testing.T) {
+	if err := run(); err != nil {
+		t.Fatal(err)
+	}
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
k2safe	800974cfff	feat: add configurable transport-independent CORS policy	2026-09-26 19:53:28 +08:00
k2safe	9fade3bedb	test: record v0.23 remote consumer and performance acceptance	2026-09-26 18:06:40 +08:00
k2safe	3bbc6f60d7	feat: add precise diagnostics and optional client copy logging controls	2026-09-26 18:04:33 +08:00
k2safe	69585dab61	test: record remote explicit configuration release acceptance	2026-09-26 16:16:37 +08:00
k2safe	d598b2ebee	feat: load explicit configuration references and remove implicit env overlays	2026-09-26 16:14:54 +08:00
k2safe	4bf6e88cfe	docs: record remote HTTP client release acceptance	2026-09-26 15:30:32 +08:00
k2safe	96e7d9629b	feat: simplify HTTP client proxy pools and authenticated JSON calls	2026-09-26 15:28:19 +08:00
k2safe	068e85132f	test: record remote configuration release acceptance	2026-09-26 14:49:28 +08:00
k2safe	c60841f901	feat: unify generated configuration loading and extensible decoders	2026-09-26 14:47:33 +08:00
k2safe	91a6beb2f3	test: verify remote copyx release and update usage reference	2026-09-25 17:31:48 +08:00
				`@@ -0,0 +1 @@`
				`{"client":{"endpoint":"https://${DEMO_HOST:-example.com}","timeout":"${DEMO_CLIENT_TIMEOUT:-2s}","token":"${DEMO_CLIENT_TOKEN:-}"},"maxItems":"${DEMO_MAX_ITEMS:-100}","allowed":["json","xml"]}`
				`@@ -0,0 +1 @@`
				`<config><client><endpoint>https://${DEMO_HOST:-example.com}</endpoint><timeout>${DEMO_CLIENT_TIMEOUT:-2s}</timeout><token>${DEMO_CLIENT_TOKEN:-}</token></client><maxItems>${DEMO_MAX_ITEMS:-100}</maxItems><allowed type="array"><item>json</item><item>xml</item></allowed></config>`