feat(web): AI 管理端 3 页面 — Prompt/分析历史/用量统计

- API 封装: prompts.ts / analysis.ts / usage.ts
- AiPromptList: CRUD + 激活/回滚 + AuthButton 权限
- AiAnalysisList: 历史列表 + 行展开查看结果
- AiUsageDashboard: 总次数/类型分布统计卡片
- 菜单注册 + 路由配置 (MainLayout + App.tsx)

apps/web/src/layouts/MainLayout.tsx

@@ -28,6 +28,9 @@ import {
   ShopOutlined,
   FileTextOutlined,
   DashboardOutlined,
+  RobotOutlined,
+  HistoryOutlined,
+  BarChartOutlined,
 } from '@ant-design/icons';
 import { useNavigate, useLocation } from 'react-router-dom';
 import { useAppStore } from '../stores/app';
@@ -69,6 +72,9 @@ const healthMenuItems: MenuItem[] = [
   { key: '/health/points-products', icon: <ShopOutlined />, label: '商品管理' },
   { key: '/health/points-orders', icon: <FileTextOutlined />, label: '订单管理' },
   { key: '/health/offline-events', icon: <CalendarOutlined />, label: '线下活动' },
+  { key: '/health/ai-prompts', icon: <RobotOutlined />, label: 'AI Prompt 管理' },
+  { key: '/health/ai-analysis', icon: <HistoryOutlined />, label: 'AI 分析历史' },
+  { key: '/health/ai-usage', icon: <BarChartOutlined />, label: 'AI 用量统计' },
 ];
 
 const sysMenuItems: MenuItem[] = [