Phase 6: Complete admin pages (Analytics, Monitor, Logs) and Phase 7: Asset management foundation

Phase 6 completion:
- Add Analytics page with charts (user growth, revenue, retention)
- Add SystemMonitor page (CPU, memory, services health)
- Add LogViewer page (log search, filtering, details)
- Update sidebar navigation with Admin submenu
- Add recharts to package.json for data visualization

Phase 7 Day 1-2:
- Create Asset and AssetLibrary domain entities
- Define AssetRepository and AssetLibraryRepository interfaces
- Implement InMemory repositories for testing
- Implement PostgreSQL repository adapter
- Update SQLAlchemy models for assets and asset_libraries
- Add database migration script 004_asset_management.sql

Architecture: Strict Clean Architecture compliance
Testing: InMemory adapters ready for unit tests
Database: Migration script with indexes and foreign keys

apps/web/src/components/layout/Sidebar.tsx

@@ -9,6 +9,10 @@ import {
   TeamOutlined,
   CrownOutlined,
   UserOutlined,
+  DashboardOutlined,
+  BarChartOutlined,
+  MonitorOutlined,
+  FileTextOutlined,
 } from '@ant-design/icons';
 import { useNavigate, useLocation } from 'react-router-dom';
 import type { MenuProps } from 'antd';
@@ -48,6 +52,43 @@ const Sidebar: React.FC<SidebarProps> = ({ collapsed }) => {
       label: '订阅管理',
       onClick: () => navigate('/subscription'),
     },
+    {
+      key: '/admin',
+      icon: <DashboardOutlined />,
+      label: 'Admin',
+      children: [
+        {
+          key: '/admin',
+          icon: <DashboardOutlined />,
+          label: 'Dashboard',
+          onClick: () => navigate('/admin'),
+        },
+        {
+          key: '/admin/users',
+          icon: <TeamOutlined />,
+          label: '用户管理',
+          onClick: () => navigate('/admin/users'),
+        },
+        {
+          key: '/admin/analytics',
+          icon: <BarChartOutlined />,
+          label: '数据分析',
+          onClick: () => navigate('/admin/analytics'),
+        },
+        {
+          key: '/admin/monitor',
+          icon: <MonitorOutlined />,
+          label: '系统监控',
+          onClick: () => navigate('/admin/monitor'),
+        },
+        {
+          key: '/admin/logs',
+          icon: <FileTextOutlined />,
+          label: '日志查看',
+          onClick: () => navigate('/admin/logs'),
+        },
+      ],
+    },
     {
       key: '/profile',
       icon: <UserOutlined />,