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/types/index.ts

@@ -0,0 +1,37 @@
+export interface HealthSummary {
+  date: string;
+  steps: number;
+  heartRate?: number;
+  sleep?: {
+    duration: number;
+    quality: number;
+  };
+  caloriesBurned?: number;
+  stress?: number;
+}
+
+export interface Activity {
+  id: string;
+  activityType: string;
+  startTime: string;
+  endTime: string;
+  duration: number;
+  distance?: number;
+  calories?: number;
+  heartRateAverage?: number;
+  heartRateMax?: number;
+}
+
+export interface Recommendation {
+  id: string;
+  category: string;
+  recommendation: string;
+  priority: 'high' | 'medium' | 'low';
+  basedOn: string[];
+}
+
+export interface TrendData {
+  date: string;
+  value: number;
+  [key: string]: any;
+}