feat: 添加学生个人中心页面和数据库备份功能

refactor(auth): 重构认证模块适配Bootstrap 5样式
feat(controller): 在登录响应中返回用户对象
feat(server): 添加学生个人中心路由
refactor(models): 重构学生和成绩模型结构
style: 更新登录和注册页面UI设计
chore: 添加数据库备份脚本和空备份文件

scripts/start.bat

@@ -1,26 +1,13 @@
 @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...
-
+:: 使用简单的语法避免编码引起的解析错误
+cd /d %~dp0
 cd ..\backend
 
-if not exist node_modules (
-    echo node_modules not found, installing dependencies...
-    call npm install
+echo Checking port 3000...
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr :3000 ^| findstr LISTENING') do (
+    taskkill /F /PID %%a
 )
 
 echo Starting Backend Server...
 start http://localhost:3000
-npm start
+npm start