fix: add service management scripts for port conflicts

New tools:
- 鍋滄鎵€鏈夋湇鍔?bat - Stop all services
- 鏌ョ湅绔彛鍗犵敤.bat - Check port usage
- 閲嶅惎鏈嶅姟.bat - Restart services
- 蹇€熶慨澶?绔彛鍗犵敤.md - Troubleshooting guide

These scripts help resolve:
- EADDRINUSE error (port 3001 already in use)
- ENOBUFS error (network connection issues)
- Timeout errors (backend not responding)

重启服务.bat

@@ -0,0 +1,21 @@
+@echo off
+chcp 65001 >nul
+echo ========================================
+echo   重启服务
+echo ========================================
+echo.
+
+echo [1/3] 停止所有现有服务...
+call "%~dp0停止所有服务.bat"
+
+echo.
+echo [2/3] 等待2秒...
+timeout /t 2 /nobreak >nul
+
+echo.
+echo [3/3] 启动服务...
+call "%~dp0一键启动.bat"
+
+echo.
+echo 重启完成！
+