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)

查看端口占用.bat

@@ -0,0 +1,50 @@
+@echo off
+chcp 65001 >nul
+echo ========================================
+echo   查看端口占用情况
+echo ========================================
+echo.
+
+echo [端口 3001 - 后端服务]
+netstat -ano | findstr :3001
+if errorlevel 1 (
+    echo ✅ 端口3001空闲
+) else (
+    echo ⚠️  端口3001已被占用
+    echo.
+    echo 占用进程详情:
+    for /f "tokens=5" %%a in ('netstat -aon ^| findstr :3001 ^| findstr LISTENING') do (
+        tasklist | findstr %%a
+    )
+)
+
+echo.
+echo [端口 3000 - 前端服务]
+netstat -ano | findstr :3000
+if errorlevel 1 (
+    echo ✅ 端口3000空闲
+) else (
+    echo ⚠️  端口3000已被占用
+    echo.
+    echo 占用进程详情:
+    for /f "tokens=5" %%a in ('netstat -aon ^| findstr :3000 ^| findstr LISTENING') do (
+        tasklist | findstr %%a
+    )
+)
+
+echo.
+echo [所有Node.js进程]
+tasklist | findstr node.exe
+if errorlevel 1 (
+    echo ℹ️  没有运行中的Node进程
+)
+
+echo.
+echo ========================================
+echo   检查完成
+echo ========================================
+echo.
+echo 如需停止服务，请运行: 停止所有服务.bat
+echo.
+pause
+