初始化工程

frontend/src/main.tsx

@@ -0,0 +1,26 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import { RouterProvider } from 'react-router-dom'
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import { router } from './router'
+import { ThemeProvider } from './components/ThemeProvider'
+import './index.css'
+
+const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      staleTime: 5_000,           // 5s 内复用,与 §4.2 Repository 不变量一致
+      refetchOnWindowFocus: false,
+    },
+  },
+})
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <ThemeProvider>
+      <QueryClientProvider client={queryClient}>
+        <RouterProvider router={router} />
+      </QueryClientProvider>
+    </ThemeProvider>
+  </React.StrictMode>
+)