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/i18n.go

@@ -10,14 +10,14 @@ import (
 func InitI18n() {
 	bundle := i18n.NewBundle(language.English)
 	bundle.RegisterUnmarshalFunc("toml", toml.Unmarshal)
-	//读取global.Config.Gin.ResourcesPath下的所有语言文件
+	// read all language files under global.Config.Gin.ResourcesPath
 	dir := Config.Gin.ResourcesPath + "/i18n"
 	fileInfos, err := os.ReadDir(dir)
 	if err != nil {
 		panic(err)
 	}
 	for _, fileInfo := range fileInfos {
-		//如果文件名不是.toml结尾
+		// if the file name does not end with .toml
 		if fileInfo.IsDir() || fileInfo.Name()[len(fileInfo.Name())-5:] != ".toml" {
 			continue
 		}