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/serverCmd.go

@@ -39,15 +39,15 @@ func (is *ServerCmdService) Create(u *model.ServerCmd) error {
 	return res
 }
 
-// SendCmd 发送命令
+// SendCmd send command
 func (is *ServerCmdService) SendCmd(port int, cmd string, arg string) (string, error) {
-	//组装命令
+	//assemble command
 	cmd = cmd + " " + arg
 	res, err := is.SendSocketCmd("v6", port, cmd)
 	if err == nil {
 		return res, nil
 	}
-	//v6连接失败，尝试v4
+	//v6connection failed, trying v4
 	res, err = is.SendSocketCmd("v4", port, cmd)
 	if err == nil {
 		return res, nil
@@ -69,14 +69,14 @@ func (is *ServerCmdService) SendSocketCmd(ty string, port int, cmd string) (stri
 		return "", err
 	}
 	defer conn.Close()
-	//发送命令
+	//send command
 	_, err = conn.Write([]byte(cmd))
 	if err != nil {
 		Logger.Debugf("%s send cmd failed: %v", ty, err)
 		return "", err
 	}
 	time.Sleep(100 * time.Millisecond)
-	//读取返回
+	//read response
 	buf := make([]byte, 1024)
 	n, err := conn.Read(buf)
 	if err != nil && err.Error() != "EOF" {