feat: unify generated configuration loading and extensible decoders

examples/managedService/internal/config/config.go

@@ -1,10 +1,9 @@
 package config
 
 import (
-	"git.yuntuo.hk/k2safe/go-omni/config"
-	"git.yuntuo.hk/k2safe/go-omni/logx"
-	"os"
 	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/config"
 )
 
 type Config struct {
@@ -22,42 +21,10 @@ func Default() Config {
 	return Config{Server: server}
 }
 
-// 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()
-}
+// Validate checks configuration before logs or dependencies open.
 func (c Config) Validate() error {
 	if err := c.Server.Validate(); err != nil {
-		return err
+		return config.AtField("server", err)
 	}
 
 	return nil