feat(web): 搭建 Web 壳层与 UI 包基线

React 19 + Vite 6 + Router 7 + TanStack Query + Zustand；Semi 二次封装与 Remix 图标统一出口；顶部模块 + 左侧功能菜单布局、Cloud Blue 主题、登录页与 401/403/404/500 页面；请求层含 token 注入、单飞刷新与统一错误提示。

apps/web/src/main.tsx

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+import '@douyinfe/semi-ui-19/react19-adapter';
+import '@lingxi/ui/semi.css';
+import '@lingxi/ui/theme/tokens.css';
+import '@lingxi/ui/styles.css';
+import '@/styles/global.css';
+import '@/styles/layout.css';
+import '@/styles/pages.css';
+
+import { LocaleProvider } from '@douyinfe/semi-ui-19';
+import { localeZhCN } from '@lingxi/ui';
+import { QueryClientProvider } from '@tanstack/react-query';
+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+import { RouterProvider } from 'react-router';
+
+import { setUnauthorizedHandler } from '@/api/client';
+import { queryClient } from '@/api/query-client';
+import { router } from '@/router';
+import { ROUTES } from '@/routes';
+
+setUnauthorizedHandler(() => {
+  void router.navigate(ROUTES.login, { replace: true });
+});
+
+const container = document.getElementById('root');
+
+if (container === null) {
+  throw new Error('找不到应用根节点 #root');
+}
+
+createRoot(container).render(
+  <StrictMode>
+    <LocaleProvider locale={localeZhCN}>
+      <QueryClientProvider client={queryClient}>
+        <RouterProvider router={router} />
+      </QueryClientProvider>
+    </LocaleProvider>
+  </StrictMode>,
+);