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

src/web/hooks/use-sidebar-collapsed.ts

@@ -1,16 +1,7 @@
-import { useEffect, useState } from "react";
+import { useState } from "react";
 
 export const SIDEBAR_COLLAPSED_STORAGE_KEY = "sidebar.collapsed";
 
-export function applyInitialSidebarCollapsed() {
-  const collapsed = readSidebarCollapsed();
-  applySidebarCollapsed(collapsed);
-}
-
-export function applySidebarCollapsed(collapsed: boolean, root: HTMLElement = document.documentElement) {
-  root.setAttribute("data-sidebar-collapsed", String(collapsed));
-}
-
 export function parseSidebarCollapsed(value: unknown): boolean {
   return value === "true";
 }
@@ -26,10 +17,6 @@ export function readSidebarCollapsed(storage: Storage = window.localStorage): bo
 export function useSidebarCollapsed() {
   const [collapsed, setCollapsedState] = useState<boolean>(() => readSidebarCollapsed());
 
-  useEffect(() => {
-    applySidebarCollapsed(collapsed);
-  }, [collapsed]);
-
   const setCollapsed = (nextCollapsed: boolean) => {
     setCollapsedState(nextCollapsed);
     writeSidebarCollapsed(nextCollapsed);