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/package.json

@@ -0,0 +1,44 @@
+{
+  "name": "garmin-health-lab-client",
+  "version": "0.1.0",
+  "private": true,
+  "proxy": "http://localhost:5000",
+  "dependencies": {
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-router-dom": "^6.14.2",
+    "axios": "^1.5.0",
+    "recharts": "^2.8.0",
+    "tailwindcss": "^3.3.2",
+    "date-fns": "^2.30.0"
+  },
+  "devDependencies": {
+    "@types/react": "^18.2.14",
+    "@types/react-dom": "^18.2.6",
+    "typescript": "^5.1.3",
+    "react-scripts": "5.0.1"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}