perf: 前端打包产物优化——路由级懒加载和 vendor 分包

- 使用 React.lazy() + Suspense 实现路由级代码分割
- 配置 manualChunks 将 react/tdesign/recharts 拆分为独立 vendor chunk
- 页面组件改为 export default 以支持动态导入
- 新增 bundle-optimization 规范，更新 frontend 导航规范

frontend/src/pages/NotFound.tsx

@@ -1,7 +1,7 @@
 import { Button } from 'tdesign-react';
 import { useNavigate } from 'react-router';
 
-export function NotFound() {
+export default function NotFound() {
   const navigate = useNavigate();
 
   return (

frontend/src/pages/Providers/index.tsx

@@ -6,7 +6,7 @@ import { ProviderTable } from './ProviderTable';
 import { ProviderForm } from './ProviderForm';
 import { ModelForm } from './ModelForm';
 
-export function ProvidersPage() {
+export default function ProvidersPage() {
   const { data: providers = [], isLoading } = useProviders();
   const createProvider = useCreateProvider();
   const updateProvider = useUpdateProvider();

frontend/src/pages/Settings/index.tsx

@@ -1,6 +1,6 @@
 import { Card } from 'tdesign-react';
 
-export function SettingsPage() {
+export default function SettingsPage() {
   return (
     <Card title="设置">
       <div style={{ textAlign: 'center', padding: '40px 0', color: 'var(--td-text-color-placeholder)' }}>

frontend/src/pages/Stats/index.tsx

@@ -5,7 +5,7 @@ import { StatCards } from './StatCards';
 import { UsageChart } from './UsageChart';
 import { StatsTable } from './StatsTable';
 
-export function StatsPage() {
+export default function StatsPage() {
   const { data: providers = [] } = useProviders();
 
   const [providerId, setProviderId] = useState<string | undefined>();

frontend/src/routes/index.tsx

@@ -1,20 +1,25 @@
+import { lazy, Suspense } from 'react';
 import { Routes, Route, Navigate } from 'react-router';
+import { Loading } from 'tdesign-react';
 import { AppLayout } from '@/components/AppLayout';
-import { ProvidersPage } from '@/pages/Providers';
-import { StatsPage } from '@/pages/Stats';
-import { SettingsPage } from '@/pages/Settings';
-import { NotFound } from '@/pages/NotFound';
+
+const ProvidersPage = lazy(() => import('@/pages/Providers'));
+const StatsPage = lazy(() => import('@/pages/Stats'));
+const SettingsPage = lazy(() => import('@/pages/Settings'));
+const NotFound = lazy(() => import('@/pages/NotFound'));
 
 export function AppRoutes() {
   return (
-    <Routes>
-      <Route element={<AppLayout />}>
-        <Route index element={<Navigate to="/providers" replace />} />
-        <Route path="providers" element={<ProvidersPage />} />
-        <Route path="stats" element={<StatsPage />} />
-        <Route path="settings" element={<SettingsPage />} />
-        <Route path="*" element={<NotFound />} />
-      </Route>
-    </Routes>
+    <Suspense fallback={<Loading />}>
+      <Routes>
+        <Route element={<AppLayout />}>
+          <Route index element={<Navigate to="/providers" replace />} />
+          <Route path="providers" element={<ProvidersPage />} />
+          <Route path="stats" element={<StatsPage />} />
+          <Route path="settings" element={<SettingsPage />} />
+          <Route path="*" element={<NotFound />} />
+        </Route>
+      </Routes>
+    </Suspense>
   );
 }

frontend/vite.config.ts

@@ -2,6 +2,12 @@ import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import path from 'node:path'
 
+const vendorChunks: Record<string, string[]> = {
+  'vendor-react': ['react', 'react-dom', 'react-router'],
+  'vendor-tdesign': ['tdesign-react', 'tdesign-icons-react'],
+  'vendor-recharts': ['recharts'],
+}
+
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [react()],
@@ -18,4 +24,20 @@ export default defineConfig({
       },
     },
   },
+  build: {
+    chunkSizeWarningLimit: 700,
+    rollupOptions: {
+      output: {
+        manualChunks(id) {
+          for (const [chunkName, modules] of Object.entries(vendorChunks)) {
+            for (const mod of modules) {
+              if (id.includes(`/node_modules/${mod}/`)) {
+                return chunkName
+              }
+            }
+          }
+        },
+      },
+    },
+  },
 })