feat(04-01): extend adminService with monitoring API methods and types

- Add AlertEvent interface (snake_case per backend raw model data)
- Add ServiceHealthEntry interface (camelCase per backend admin.ts remapping)
- Add AnalyticsSummary interface (camelCase per analyticsService.ts)
- Add getHealth(), getAnalytics(range), getAlerts(), acknowledgeAlert(id) methods

frontend/src/services/adminService.ts

@@ -15,6 +15,36 @@ apiClient.interceptors.request.use(async (reqConfig) => {
   return reqConfig;
 });
 
+export interface AlertEvent {
+  id: string;
+  service_name: string;
+  alert_type: 'service_down' | 'service_degraded' | 'recovery';
+  status: 'active' | 'acknowledged' | 'resolved';
+  message: string | null;
+  details: Record<string, unknown> | null;
+  created_at: string;
+  acknowledged_at: string | null;
+  resolved_at: string | null;
+}
+
+export interface ServiceHealthEntry {
+  service: string;
+  status: 'healthy' | 'degraded' | 'down' | 'unknown';
+  checkedAt: string | null;
+  latencyMs: number | null;
+  errorMessage: string | null;
+}
+
+export interface AnalyticsSummary {
+  range: string;
+  totalUploads: number;
+  succeeded: number;
+  failed: number;
+  successRate: number;
+  avgProcessingMs: number | null;
+  generatedAt: string;
+}
+
 export interface AdminUser {
   id: string;
   email: string;
@@ -103,6 +133,38 @@ class AdminService {
   async sendWeeklySummaryEmail(): Promise<void> {
     await apiClient.post('/admin/send-weekly-summary');
   }
+
+  /**
+   * Get service health status for all monitored services (admin only)
+   */
+  async getHealth(): Promise<ServiceHealthEntry[]> {
+    const response = await apiClient.get('/admin/health');
+    return response.data.data;
+  }
+
+  /**
+   * Get processing analytics summary for a given time range (admin only)
+   */
+  async getAnalytics(range: string = '24h'): Promise<AnalyticsSummary> {
+    const response = await apiClient.get(`/admin/analytics?range=${range}`);
+    return response.data.data;
+  }
+
+  /**
+   * Get active alert events (admin only)
+   */
+  async getAlerts(): Promise<AlertEvent[]> {
+    const response = await apiClient.get('/admin/alerts');
+    return response.data.data;
+  }
+
+  /**
+   * Acknowledge an alert by ID (admin only)
+   */
+  async acknowledgeAlert(id: string): Promise<AlertEvent> {
+    const response = await apiClient.post(`/admin/alerts/${id}/acknowledge`);
+    return response.data.data;
+  }
 }
 
 export const adminService = new AdminService();