feat: 修复 H5 底部导航覆盖 + 更新项目进度文档

## H5 底部导航修复 (Bug #10)
- 精简 App.vue，移除重复 tabbar，仅保留全局样式
- uni-page 设置 height: calc(100% - 50px) + overflow-y: auto
- 内容区域精确停在底部导航上方，独立滚动不再叠加
- 恢复 custom-tab-bar 组件

## 项目进度文档
- PROGRESS.md 更新至 10 个 Bug 修复
- 新增 H5 底部导航修复记录
- 新增历史变更条目

backend/app/celery_app.py

@@ -20,4 +20,26 @@ celery_app.conf.update(
     task_time_limit=300,
     worker_prefetch_multiplier=4,
     worker_max_tasks_per_child=1000,
+    beat_schedule={
+        "check-silent-customers": {
+            "task": "app.workers.tasks.check_silent_customers",
+            "schedule": 3600.0,
+        },
+        "update-customer-health-cache": {
+            "task": "app.workers.tasks.update_customer_health_cache",
+            "schedule": 3600.0,
+        },
+        "cleanup-old-sessions": {
+            "task": "app.workers.tasks.cleanup_old_sessions",
+            "schedule": 86400.0,
+        },
+        "daily-corpus-training": {
+            "task": "app.workers.tasks.run_daily_corpus_training",
+            "schedule": 86400.0,
+        },
+        "check-followup-engine": {
+            "task": "app.workers.tasks.check_followup_engine",
+            "schedule": 21600.0,
+        },
+    },
 )