refactor: 前端 UI 框架从 TDesign 迁移到 antd 6.x

- 移除 tdesign-react + tdesign-icons-react，新增 antd@6.4.3 + @ant-design/icons@6.2.3
- Layout/Header/Sider/Content 替换 TDesign Layout，Sider 内置折叠管理
- Segmented 替换 RadioGroup 主题切换，ConfigProvider 主题算法切换
- Menu items prop 模式，Sidebar 简化为无 props 纯组件
- Table/Modal/Form/Input.TextArea/Tabs/Tag/Popconfirm 全量迁移
- App.useApp().message 替换 MessagePlugin（hooks 模式）
- --td-* CSS 变量替换为 --ant-* antd CSS 变量
- 测试适配：ConfigProvider+App wrapper，.ant-menu-item-selected，antd CSS-in-JS jsdom 兼容
- 文档更新：frontend.md, development/README.md, config.yaml, deploy.md
- vendor-antd chunk 755KB gzipped 240KB

vite.config.ts

@@ -18,8 +18,8 @@ export default defineConfig({
               test: /[\\/]node_modules[\\/](react-router)[\\/]/,
             },
             {
-              name: "vendor-tdesign",
-              test: /[\\/]node_modules[\\/](tdesign-react|tdesign-icons-react)[\\/]/,
+              name: "vendor-antd",
+              test: /[\\/]node_modules[\\/](antd|@ant-design)[\\/]/,
             },
             {
               name: "vendor-chart",