Initial commit: Set up Garmin Health Lab project structure

- Initialize monorepo with root workspace configuration
- Set up Express.js backend with TypeScript
- Set up React 18 frontend with TypeScript
- Create database schema with SQLite
- Implement project architecture and documentation
- Add development and deployment guidelines

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

client/src/pages/Recommendations.tsx

@@ -0,0 +1,13 @@
+import React from 'react';
+import './Pages.css';
+
+function Recommendations() {
+  return (
+    <div className="page">
+      <h2>健康建议</h2>
+      <p className="placeholder">健康建议页面即将推出...</p>
+    </div>
+  );
+}
+
+export default Recommendations;