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

tests/web/test-utils.tsx

@@ -1,5 +1,6 @@
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { render } from "@testing-library/react";
+import { App, ConfigProvider } from "antd";
 import { mock } from "bun:test";
 import { createElement, StrictMode } from "react";
 import { MemoryRouter } from "react-router";
@@ -36,7 +37,11 @@ export function renderWithProviders(ui: React.ReactElement, options?: RenderWith
         createElement(
           QueryClientProvider,
           { client: queryClient },
-          createElement(MemoryRouter, { initialEntries: [initialRoute] }, ui),
+          createElement(
+            MemoryRouter,
+            { initialEntries: [initialRoute] },
+            createElement(ConfigProvider, null, createElement(App, null, ui)),
+          ),
         ),
       ),
     ),