feat(server): 添加数据库连接测试并优化启动脚本

添加了服务器启动时的数据库连接测试功能，确保数据库可用性
新增 start.bat 和 dev.bat 脚本用于简化开发和生产环境启动
脚本会自动检查端口占用并处理依赖安装

scripts/start.bat

@@ -0,0 +1,26 @@
+@echo off
+setlocal enabledelayedexpansion
+
+echo Checking if WebWork is already running...
+
+:: 查找占用 3000 端口的进程 PID
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr :3000 ^| findstr LISTENING') do (
+    set PID=%%a
+    if not "!PID!"=="" (
+        echo Port 3000 is already in use by PID !PID!. Killing process...
+        taskkill /F /PID !PID!
+    )
+)
+
+echo Starting WebWork System...
+
+cd ..\backend
+
+if not exist node_modules (
+    echo node_modules not found, installing dependencies...
+    call npm install
+)
+
+echo Starting Backend Server...
+start http://localhost:3000
+npm start