## MODIFIED Requirements

### Requirement: Global Notification Bell

The admin frontend SHALL provide a global notification bell in the top navigation near the settings and user avatar entries.

#### Scenario: Display unread count

- **GIVEN** 用户已登录后台
- **WHEN** 顶部导航加载未读通知数量
- **THEN** 铃铛 MUST call `GET /api/admin/notifications/unread-count`
- **AND** 数量 MUST display as `0`, `1` through `99`, or `99+`

#### Scenario: Open paginated notification drawer

- **WHEN** 用户点击顶部通知铃铛
- **THEN** 页面 MUST display notification items from `GET /api/admin/notifications` using `page=1` and `page_size=10`
- **AND** 抽屉 MUST provide 全部、审批、临期、同步/系统分类
- **AND** 抽屉 MUST provide page controls based on the response `total`
- **AND** changing page MUST replace the visible items instead of appending items from a scroll event
- **AND** changing category MUST reset the page to 1
- **AND** 抽屉 MUST provide an entry to `/notifications`