Rewrite from Go + vanilla JS to Python (FastAPI) + React (TypeScript)

- Backend: Python 3.12 with FastAPI, SQLAlchemy, boto3
- Frontend: React 18 with TypeScript, Vite build tooling
- Updated Dockerfile for multi-stage Node + Python build
- Updated CI pipeline for Python backend
- Removed old Go code (cmd/, internal/, go.mod, go.sum)
- Updated README with new tech stack documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/App.tsx

@@ -0,0 +1,19 @@
+import { Routes, Route } from 'react-router-dom';
+import Layout from './components/Layout';
+import Home from './pages/Home';
+import GrovePage from './pages/GrovePage';
+import TreePage from './pages/TreePage';
+
+function App() {
+  return (
+    <Layout>
+      <Routes>
+        <Route path="/" element={<Home />} />
+        <Route path="/grove/:groveName" element={<GrovePage />} />
+        <Route path="/grove/:groveName/:treeName" element={<TreePage />} />
+      </Routes>
+    </Layout>
+  );
+}
+
+export default App;