重构代码结构，优化连接管理和日志记录

server/fwd/socks/request.go

@@ -253,7 +253,13 @@ func (s *Server) handleConnect(ctx context.Context, conn net.Conn, req *Request)
 	}
 
 	slog.Info("需要向 " + req.DestAddr.Address() + " 建立连接")
-	s.Conn <- ProxyConn{conn, req.realDestAddr.Address()}
+	select {
+	case <-s.ctx.Done():
+		if conn != nil {
+			utils.Close(conn)
+		}
+	case s.Conn <- ProxyConn{conn, req.realDestAddr.Address()}:
+	}
 	return nil
 }