feat: replace mapping generation with checked copy utilities

examples/copying/README.md

@@ -0,0 +1,23 @@
+# 结构复制示例
+
+在框架仓库根目录运行 `go run ./examples/copying`；不需要数据库、网络服务或 JSON 映射配置。
+
+示例包含：可复用构造器、Go 字段改名、时间自定义转换、保留 false、深拷贝切片、同类型 Clone，以及拒绝自定义转换器返回输入的原切片。
+
+预期输出：
+
+```text
+name=sample enabled=false time=2026-01-01T00:00:00Z sourceTag=original
+clone detached: true
+shared converter rejected: true
+```
+
+测试：`go test -race ./examples/copying`。完整策略、限制与旧生成映射迁移见 [COPY.md](../../COPY.md)。
+
+独立工资三端的实际生成、HTTP 与金额用例见 [集成测试](../../cmd/go-omni/apigen/copyConsumer_test.go) 和 [公共契约](../../cmd/go-omni/apigen/testdata/composition/service.api)。框架根目录运行：
+
+```sh
+GO_OMNI_SCAFFOLD_INTEGRATION=1 go test ./cmd/go-omni/apigen -run TestCopyxThreeEndpointConsumer -count=1
+```
+
+该测试在临时独立项目中执行，三个入口共用一个普通 Go copyx helper。公共字段新增时，只修改公共契约和独立业务结构，三个入口的转换规则不增加。

examples/copying/main.go

@@ -0,0 +1,61 @@
+// copying demonstrates optional Go-to-Go conversion and checked deep copying.
+package main
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/copyx"
+)
+
+type Input struct {
+	Name      string
+	Enabled   bool
+	Tags      []string
+	CreatedAt time.Time
+}
+type View struct {
+	DisplayName string
+	Enabled     bool
+	Tags        []string
+	CreatedAt   string
+}
+
+func run() error {
+	converter, err := copyx.New(
+		copyx.WithDeepCopy(),
+		copyx.WithFieldNames[Input, View](map[string]string{"Name": "DisplayName"}),
+		copyx.WithConverter(func(v time.Time) (string, error) { return v.UTC().Format(time.RFC3339), nil }),
+	)
+	if err != nil {
+		return err
+	}
+	source := Input{Name: "sample", Enabled: false, Tags: []string{"original"}, CreatedAt: time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)}
+	var target View
+	if err = converter.Copy(&target, source); err != nil {
+		return err
+	}
+	target.Tags[0] = "changed"
+	fmt.Printf("name=%s enabled=%t time=%s sourceTag=%s\n", target.DisplayName, target.Enabled, target.CreatedAt, source.Tags[0])
+
+	cloned, err := copyx.Clone(source)
+	if err != nil {
+		return err
+	}
+	cloned.Tags[0] = "separate"
+	fmt.Println("clone detached:", source.Tags[0] == "original")
+
+	_, err = copyx.Clone(source.Tags, copyx.WithConverter(func(v []string) ([]string, error) { return v, nil }))
+	fmt.Println("shared converter rejected:", errors.Is(err, copyx.ErrSharedReference))
+	if !errors.Is(err, copyx.ErrSharedReference) {
+		return errors.New("expected alias rejection")
+	}
+	return nil
+}
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}

examples/copying/main_test.go

@@ -0,0 +1,9 @@
+package main
+
+import "testing"
+
+func TestExample(t *testing.T) {
+	if err := run(); err != nil {
+		t.Fatal(err)
+	}
+}

examples/managedService/.goOmni/apiManifest.json

@@ -1,6 +1,6 @@
 {
   "generatorConfig": true,
-  "templateVersion": "v0.18.0-preview",
+  "templateVersion": "v0.19.0-preview",
   "profile": {
     "database": "none",
     "storage": "none",

examples/managedService/go.mod

@@ -2,7 +2,7 @@ module example.com/managed
 
 go 1.22.0
 
-require git.yuntuo.hk/k2safe/go-omni v0.18.0-preview
+require git.yuntuo.hk/k2safe/go-omni v0.19.0-preview
 
 require (
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect