Scaffold new frontend with Vite + React 18 + TypeScript

frontend/src/App.tsx

@@ -0,0 +1,8 @@
+export default function App() {
+  return (
+    <div style={{ padding: '2rem', fontFamily: 'sans-serif' }}>
+      <h1>PCA Pijac — scaffolded</h1>
+      <p>Stack: Vite + React + TypeScript + TanStack Router + TanStack Query + Tailwind + shadcn/ui</p>
+    </div>
+  )
+}

frontend/src/index.css

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+body {
+  margin: 0;
+  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
+}

frontend/src/main.tsx

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+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import App from './App'
+import './index.css'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)