feat(admin): scaffold Vite+React admin workspace

apps/admin/src/main.tsx

@@ -0,0 +1,15 @@
+import React from 'react';
+import { createRoot } from 'react-dom/client';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import App from './App';
+import './styles.css';
+
+const queryClient = new QueryClient();
+
+createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <QueryClientProvider client={queryClient}>
+      <App />
+    </QueryClientProvider>
+  </React.StrictMode>
+);