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>

package.json

@@ -0,0 +1,22 @@
+{
+  "name": "garmin-health-lab",
+  "version": "0.1.0",
+  "description": "佳明健康数据分析平台",
+  "private": true,
+  "scripts": {
+    "dev": "concurrently \"npm run dev:server\" \"npm run dev:client\"",
+    "dev:server": "cd server && npm run dev",
+    "dev:client": "cd client && npm start",
+    "build": "npm run build:server && npm run build:client",
+    "build:server": "cd server && npm run build",
+    "build:client": "cd client && npm run build",
+    "start": "node server/dist/index.js"
+  },
+  "workspaces": [
+    "server",
+    "client"
+  ],
+  "devDependencies": {
+    "concurrently": "^8.2.0"
+  }
+}