优化全局数据存储方式，以节点 id 为 key 保存相关数据；修复节点下线监听未关闭问题

gateway/fwd/user.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/hex"
 	"errors"
+	"fmt"
 	"io"
 	"log/slog"
 	"proxy-server/gateway/core"
@@ -14,25 +15,33 @@ import (
 	"time"
 )
 
-func (s *Service) listenUser(port uint16, ctrl io.Writer) error {
+func (s *Service) listenUser(ctx context.Context, port uint16, ctrl io.Writer) error {
 	dspt, err := dispatcher.New(port, time.Duration(env.AppUserTimeout)*time.Second)
 	if err != nil {
 		return err
 	}
-	defer dspt.Close()
+	defer dspt.Stop()
 
+	var errCh = make(chan error)
 	go func() {
 		err := dspt.Run()
 		if err != nil {
-			slog.Error("代理服务运行失败", "err", err)
+			// slog.Error("代理服务运行失败", "err", err)
+			err = fmt.Errorf("协议嗅探服务运行失败: %w", err)
 		}
+		errCh <- err
 	}()
 
 	// 处理连接
 	for {
 		select {
-		case <-s.ctx.Done():
+		case <-ctx.Done():
 			return nil
+		case err := <-errCh:
+			if err != nil {
+				err = fmt.Errorf("监听转发端口失败: %w", err)
+			}
+			return err
 		case user := <-dspt.Conn:
 			metrics.TimerAuth.Store(user.Conn, time.Now())
 			s.userConnWg.Add(1)