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/api/v1/notification.py

@@ -0,0 +1,66 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.ext.asyncio import AsyncSession
+from typing import Annotated, Optional
+from app.database import get_db
+from app.services.notification import NotificationService
+from app.api.v1.deps import get_current_user_id
+
+router = APIRouter()
+
+
+@router.get("")
+async def list_notifications(
+    page: int = Query(1, ge=1),
+    size: int = Query(20, ge=1, le=100),
+    unread_only: bool = Query(False),
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = NotificationService(db)
+    return await service.list_notifications(user_id, page, size, unread_only)
+
+
+@router.get("/unread-count")
+async def unread_count(
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = NotificationService(db)
+    count = await service.get_unread_count(user_id)
+    return {"count": count}
+
+
+@router.patch("/{notification_id}/read")
+async def mark_read(
+    notification_id: str,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = NotificationService(db)
+    success = await service.mark_read(user_id, notification_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Notification not found")
+    return {"status": "ok"}
+
+
+@router.post("/read-all")
+async def mark_all_read(
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = NotificationService(db)
+    count = await service.mark_all_read(user_id)
+    return {"status": "ok", "count": count}
+
+
+@router.delete("/{notification_id}")
+async def delete_notification(
+    notification_id: str,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = NotificationService(db)
+    success = await service.delete_notification(user_id, notification_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Notification not found")
+    return {"status": "ok"}