feat(web): 提取共享基础组件 — dayjs/format/EntityName/FilterBar/PageContainer/DrawerForm

- utils/dayjs.ts: 集中初始化 relativeTime 插件 + zh-cn locale
- utils/format.ts: formatDate/formatDateTime/formatRelative/calcAge
- components/EntityName.tsx: UUID→姓名兜底显示
- components/FilterBar.tsx: 统一筛选栏容器
- components/PageContainer.tsx: 统一页面容器（标题+筛选+表格+暗色模式）
- components/DrawerForm.tsx: 抽屉式表单容器（分组+双列网格）
- AlertList.tsx: 迁移到集中 dayjs 导入

apps/web/src/pages/health/AlertList.tsx

@@ -10,9 +10,7 @@ import {
 } from 'antd';
 import { CheckOutlined, StopOutlined } from '@ant-design/icons';
 import type { ColumnsType, TablePaginationConfig } from 'antd/es/table';
-import dayjs from 'dayjs';
-import relativeTime from 'dayjs/plugin/relativeTime';
-import 'dayjs/locale/zh-cn';
+import { dayjs } from '../../utils/dayjs';
 import {
   listAlerts,
   acknowledgeAlert,
@@ -22,9 +20,6 @@ import {
 import { AuthButton } from '../../components/AuthButton';
 import { useThemeMode } from '../../hooks/useThemeMode';
 
-dayjs.extend(relativeTime);
-dayjs.locale('zh-cn');
-
 // --- 常量映射 ---
 
 const STATUS_OPTIONS = [