Initial project setup: monorepo structure with frontend and backend

- Set up pnpm workspace with frontend (React + Vite) and backend (Express + Prisma)
- Configure TypeScript, ESLint, and Prettier
- Add Prisma schema for database models (User, Course, Lesson, Progress, etc.)
- Create basic frontend structure with Tailwind CSS and shadcn/ui
- Add environment configuration files
- Update README with project overview and setup instructions
- Complete Phase 0: Project initialization

packages/frontend/src/App.tsx

@@ -0,0 +1,15 @@
+import { BrowserRouter as Router, Routes, Route } from 'react-router-dom';
+import Home from './pages/Home';
+
+function App() {
+  return (
+    <Router>
+      <Routes>
+        <Route path="/" element={<Home />} />
+      </Routes>
+    </Router>
+  );
+}
+
+export default App;
+