i18n: Translate all Chinese to English across the codebase

Translate Chinese comments, log/error messages, validator labels and
Swagger annotations to English throughout the source code, generated
Swagger docs, config files and CI workflows.

Make the English README primary: README.md now holds the English docs
and README_EN.md holds the Chinese version, with cross-language links
updated accordingly.

Note: the generated docs/ swagger files were translated in place; run
`go generate ./...` (swag init) to regenerate them from the now-English
annotations when a Go toolchain is available.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

config/config.go

@@ -58,7 +58,7 @@ func (a *Admin) Init() {
 	}
 }
 
-// Init 初始化配置
+// Init initializes the configuration
 func Init(rowVal *Config, path string) *viper.Viper {
 	if path == "" {
 		path = DefaultConfig
@@ -77,9 +77,9 @@ func Init(rowVal *Config, path string) *viper.Viper {
 		v.WatchConfig()
 
 
-			//监听配置修改没什么必要
+			// watching for config changes is not really necessary
 			v.OnConfigChange(func(e fsnotify.Event) {
-				//配置文件修改监听
+				// watch for config file changes
 				fmt.Println("config file changed:", e.Name)
 				if err2 := v.Unmarshal(rowVal); err2 != nil {
 					fmt.Println(err2)
@@ -96,7 +96,7 @@ func Init(rowVal *Config, path string) *viper.Viper {
 	return v
 }
 
-// ReadEnv 读取环境变量
+// ReadEnv reads environment variables
 func ReadEnv(rowVal interface{}) *viper.Viper {
 	v := viper.New()
 	v.AutomaticEnv()