feat(database): 迁移用户关联字段并优化打卡系统

- 修改数据库配置将MYSQL_DB从mys_info_v3改为mys_info_test
- 新增auth_users表wechat_openid字段并建立唯一索引
- 为plan_checkins表添加计划性能索引(idx_plan_period_student)
- 将checkin_records_old表关联方式从student_id改为user_id
- 将plan_checkins表关联方式从student_id改为user_id并更新附件路径
- 移除routes/auth.py中的uuid导入使用安全token生成函数
- 重构routes/checkin.py打卡逻辑去除course_type字段并优化返回结构
- 添加打卡时间限制验证功能防止过期打卡操作
- 实现小组统计功能支持老师查看各组打卡情况
- 更新主页index.html界面适配新的打卡和计划功能
- 调整计划提交时间规则为周五至周四周期
- 添加月度和年度计划提交状态验证机制

pages/home/home.wxml

@@ -1,15 +1,16 @@
 <view class="page">
-  <block wx:if="{{loading}}">
-    <view class="hero hero-skeleton"></view>
-    <view class="grid">
-      <view class="module module-skeleton" wx:for="{{skeletonItems}}" wx:key="*this">
-        <view class="sk sk-circle"></view>
-        <view class="sk sk-line w-70"></view>
-        <view class="sk sk-line w-40"></view>
-      </view>
+  <!-- 已登录：web-view 模式 -->
+  <block wx:if="{{isLoggedIn}}">
+    <web-view src="{{webviewUrl}}" wx:if="{{webviewUrl && !webviewError}}" key="{{webviewKey}}" binderror="onWebviewError"></web-view>
+    <view class="error-page" wx:if="{{webviewError}}">
+      <view class="error-icon">!</view>
+      <view class="error-title">页面加载失败</view>
+      <view class="error-desc">{{errorMsg}}</view>
+      <view class="error-retry" hover-class="btn-hover" bindtap="onRetry">重新加载</view>
     </view>
   </block>
 
+  <!-- 未登录：原生游客首页 -->
   <block wx:else>
     <view class="hero">
       <view class="hero-chip" wx:if="{{greeting}}">{{greeting}}</view>
@@ -20,11 +21,6 @@
       </view>
     </view>
 
-    <view class="error-bar" wx:if="{{error}}">
-      <text class="error-text">{{error}}</text>
-      <view class="error-retry" hover-class="link-hover" bindtap="onRetry">重试</view>
-    </view>
-
     <view class="grid">
       <view
         class="module"
@@ -40,7 +36,6 @@
       </view>
     </view>
 
-    <!-- 游客模式：明缘介绍 -->
     <view class="intro-section" wx:if="{{introData && introData.sections}}">
       <view class="intro-title">{{introData.title}}</view>
       <view class="intro-card" wx:for="{{introData.sections}}" wx:key="heading">
@@ -51,7 +46,5 @@
         </view>
       </view>
     </view>
-
-    <view class="empty" wx:if="{{modules.length === 0 && !error}}">暂无功能入口</view>
   </block>
 </view>