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>

server/src/index.ts

@@ -0,0 +1,42 @@
+import express from 'express';
+import cors from 'cors';
+import dotenv from 'dotenv';
+import { initializeDatabase } from './utils/database';
+import authRoutes from './routes/auth';
+import garminRoutes from './routes/garmin';
+import healthRoutes from './routes/health';
+import analysisRoutes from './routes/analysis';
+import { errorHandler } from './middleware/errorHandler';
+
+dotenv.config();
+
+const app = express();
+const PORT = process.env.PORT || 5000;
+
+// Middleware
+app.use(express.json());
+app.use(cors({
+  origin: process.env.CORS_ORIGIN || 'http://localhost:3000',
+  credentials: true
+}));
+
+// Initialize database
+initializeDatabase();
+
+// Routes
+app.use('/api/auth', authRoutes);
+app.use('/api/garmin', garminRoutes);
+app.use('/api/health', healthRoutes);
+app.use('/api/analysis', analysisRoutes);
+
+// Health check
+app.get('/api/health/status', (req, res) => {
+  res.json({ status: 'ok', timestamp: new Date().toISOString() });
+});
+
+// Error handling
+app.use(errorHandler);
+
+app.listen(PORT, () => {
+  console.log(`Server running on http://localhost:${PORT}`);
+});