Add React race hub frontend

frontend/src/main.tsx

@@ -0,0 +1,23 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import { RouterProvider } from '@tanstack/react-router'
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import { router } from './router'
+import './styles/app.css'
+
+const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      staleTime: 30_000,
+      retry: 1,
+    },
+  },
+})
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <QueryClientProvider client={queryClient}>
+      <RouterProvider router={router} />
+    </QueryClientProvider>
+  </React.StrictMode>,
+)