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>

global/apiValidator.go

@@ -24,7 +24,7 @@ import (
 func ApiInitValidator() {
 	validate := validator.New()
 
-	// 定义不同的语言翻译
+	// define translations for different languages
 	enT := en.New()
 	cn := zh_Hans_CN.New()
 	koT := ko.New()
@@ -81,7 +81,7 @@ func ApiInitValidator() {
 		return label
 	})
 	Validator.Validate = validate
-	Validator.UT = uni // 存储 Universal Translator
+	Validator.UT = uni // store the Universal Translator
 	Validator.VTrans = zhTrans
 
 	Validator.ValidStruct = func(ctx *gin.Context, i interface{}) []string {