feat(FN-005): implement frontend foundation with auth and routing

- Add OIDC authentication with PKCE flow
- Create dashboard shell with sidebar and header
- Implement project management UI (list, create, detail)
- Add tool spawn page with tool/project selection
- Create tool instance detail page with status and controls
- Set up React Router with route guards
- Add Zustand auth store and API client with types

apps/web/src/main.tsx

@@ -1,10 +1,23 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
+import { RouterProvider } from 'react-router-dom'
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 import './index.css'
-import App from './App'
+import { router } from './router'
+
+const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      staleTime: 5 * 60 * 1000, // 5 minutes
+      retry: 1,
+    },
+  },
+})
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
-    <App />
+    <QueryClientProvider client={queryClient}>
+      <RouterProvider router={router} />
+    </QueryClientProvider>
   </StrictMode>,
 )