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>

service/audit.go

@@ -22,7 +22,7 @@ func (as *AuditService) AuditConnList(page, pageSize uint, where func(tx *gorm.D
 	return
 }
 
-// Create 创建
+// Create create
 func (as *AuditService) CreateAuditConn(u *model.AuditConn) error {
 	res := DB.Create(u).Error
 	return res
@@ -31,7 +31,7 @@ func (as *AuditService) DeleteAuditConn(u *model.AuditConn) error {
 	return DB.Delete(u).Error
 }
 
-// Update 更新
+// Update update
 func (as *AuditService) UpdateAuditConn(u *model.AuditConn) error {
 	return DB.Model(u).Updates(u).Error
 }
@@ -80,7 +80,7 @@ func (as *AuditService) DeleteAuditFile(u *model.AuditFile) error {
 	return DB.Delete(u).Error
 }
 
-// Update 更新
+// Update update
 func (as *AuditService) UpdateAuditFile(u *model.AuditFile) error {
 	return DB.Model(u).Updates(u).Error
 }