feat: 重构前端为企业 Admin 后台布局，引入 React Router 路由

- 引入 React Router v7 (Declarative mode) 实现 SPA 路由
- 重构 Layout 为 Header + 侧边栏 + 内容区的企业 Admin 布局
- 新增侧边栏菜单组件，支持折叠/展开，状态持久化到 localStorage
- 新增示例页面：仪表盘、用户管理、系统设置、404
- 菜单配置与路由统一为单一数据源 (menu.tsx)
- Vite code splitting 新增 vendor-router 组
- 更新 DEVELOPMENT.md 和 README.md 文档

bun.lock

@@ -9,6 +9,7 @@
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         "react": "^19.2.6",
         "react-dom": "^19.2.6",
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         "recharts": "^3.8.1",
         "tdesign-icons-react": "^0.6.4",
         "tdesign-react": "^1.16.9",
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