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.wxss

@@ -36,12 +36,17 @@
   color: #E8DCCB;
   line-height: 1.6;
 }
-.hero-skeleton {
-  min-height: 240rpx;
-  background: linear-gradient(90deg, #EFE6D9 25%, #FAF4EC 50%, #EFE6D9 75%);
-  background-size: 200% 100%;
-  animation: shimmer 1.4s ease-in-out infinite;
+.hero-login-tip {
+  margin-top: 24rpx;
+  display: inline-block;
+  padding: 12rpx 28rpx;
+  background: rgba(198, 123, 48, 0.25);
+  border: 1rpx solid rgba(227, 179, 124, 0.4);
+  border-radius: 999rpx;
+  color: #E3B37C;
+  font-size: 24rpx;
 }
+.btn-hover { opacity: 0.7; }
 
 /* ---- 模块网格 ---- */
 .grid {
@@ -98,72 +103,6 @@
   white-space: nowrap;
 }
 
-/* ---- 骨架屏 ---- */
-.module-skeleton {
-  box-shadow: none;
-}
-.sk {
-  background: #EDE3D6;
-  border-radius: 10rpx;
-}
-.sk-circle {
-  width: 84rpx;
-  height: 84rpx;
-  border-radius: 50%;
-  margin-bottom: 16rpx;
-}
-.sk-line {
-  height: 24rpx;
-  margin-top: 12rpx;
-}
-.w-70 { width: 70%; }
-.w-40 { width: 40%; }
-
-/* ---- 错误 / 空状态 ---- */
-.error-bar {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 20rpx;
-  margin-top: 32rpx;
-  padding: 22rpx 24rpx;
-  border-radius: 14rpx;
-  background: #FDEAEA;
-  color: #C0392B;
-  font-size: 24rpx;
-}
-.error-text {
-  flex: 1;
-  min-width: 0;
-}
-.error-retry {
-  flex-shrink: 0;
-  color: #C67B30;
-  font-weight: 700;
-  padding: 4rpx 0 4rpx 16rpx;
-}
-.link-hover { opacity: 0.7; }
-.empty {
-  padding: 80rpx 0;
-  text-align: center;
-  color: #B6A996;
-  font-size: 26rpx;
-}
-
-@keyframes shimmer {
-  0% { background-position: 200% 0; }
-  100% { background-position: -200% 0; }
-}
-.hero-login-tip {
-  margin-top: 24rpx;
-  display: inline-block;
-  padding: 12rpx 28rpx;
-  background: rgba(198, 123, 48, 0.25);
-  border: 1rpx solid rgba(227, 179, 124, 0.4);
-  border-radius: 999rpx;
-  color: #E3B37C;
-  font-size: 24rpx;
-}
 /* ---- intro section ---- */
 .intro-section {
   margin-top: 40rpx;
@@ -205,4 +144,48 @@
   font-size: 25rpx;
   color: #5A4A3A;
   line-height: 1.8;
-}
+}
+
+/* ---- web-view 错误页 ---- */
+.error-page {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: 120rpx 60rpx;
+  height: 100vh;
+  box-sizing: border-box;
+}
+.error-icon {
+  width: 120rpx;
+  height: 120rpx;
+  border-radius: 50%;
+  background: #FDEAEA;
+  color: #C0392B;
+  font-size: 64rpx;
+  font-weight: 700;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  margin-bottom: 32rpx;
+}
+.error-title {
+  font-size: 32rpx;
+  font-weight: 700;
+  color: #2C1810;
+  margin-bottom: 16rpx;
+}
+.error-desc {
+  font-size: 26rpx;
+  color: #8B7A6A;
+  text-align: center;
+  line-height: 1.6;
+  margin-bottom: 40rpx;
+}
+.error-retry {
+  padding: 20rpx 60rpx;
+  background: #C67B30;
+  color: #fff;
+  font-size: 28rpx;
+  border-radius: 999rpx;
+}