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/services/api.ts

@@ -0,0 +1,78 @@
+import axios, { AxiosInstance } from 'axios';
+
+const API_BASE_URL = process.env.REACT_APP_API_URL || 'http://localhost:5000/api';
+
+class ApiClient {
+  private client: AxiosInstance;
+
+  constructor() {
+    this.client = axios.create({
+      baseURL: API_BASE_URL,
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    });
+  }
+
+  // Auth endpoints
+  login(email: string, password: string) {
+    return this.client.post('/auth/login', { email, password });
+  }
+
+  logout() {
+    return this.client.post('/auth/logout');
+  }
+
+  // Garmin endpoints
+  syncGarminData() {
+    return this.client.post('/garmin/sync');
+  }
+
+  getGarminSyncStatus() {
+    return this.client.get('/garmin/status');
+  }
+
+  // Health endpoints
+  getHealthSummary(startDate?: string, endDate?: string) {
+    return this.client.get('/health/summary', {
+      params: { startDate, endDate }
+    });
+  }
+
+  getStepsData(startDate?: string, endDate?: string) {
+    return this.client.get('/health/steps', {
+      params: { startDate, endDate }
+    });
+  }
+
+  getHeartRateData(startDate?: string, endDate?: string) {
+    return this.client.get('/health/heart-rate', {
+      params: { startDate, endDate }
+    });
+  }
+
+  getSleepData(startDate?: string, endDate?: string) {
+    return this.client.get('/health/sleep', {
+      params: { startDate, endDate }
+    });
+  }
+
+  getActivities(startDate?: string, endDate?: string) {
+    return this.client.get('/health/activities', {
+      params: { startDate, endDate }
+    });
+  }
+
+  // Analysis endpoints
+  getTrends(metricType?: string) {
+    return this.client.get('/analysis/trends', {
+      params: { metricType }
+    });
+  }
+
+  getRecommendations() {
+    return this.client.get('/analysis/recommendations');
+  }
+}
+
+export const apiClient = new ApiClient();