feat(admin): wire analytics dashboard route

src/lib/api.ts

@@ -416,6 +416,22 @@ class ApiClient {
     });
   }
 
+  async getAdminDashboard(params?: {
+    date_from?: string;
+    date_to?: string;
+    event_id?: number;
+    granularity?: 'auto' | 'day' | 'week' | 'month';
+  }) {
+    const query = new URLSearchParams();
+    if (params?.date_from) query.set('date_from', params.date_from);
+    if (params?.date_to) query.set('date_to', params.date_to);
+    if (params?.event_id != null) query.set('event_id', String(params.event_id));
+    if (params?.granularity) query.set('granularity', params.granularity);
+    return this.request<Types.AdminDashboardAnalyticsSchema>(
+      `/api/analytics/admin/dashboard${query.toString() ? `?${query.toString()}` : ''}`,
+    );
+  }
+
   // ============= Blog Endpoints =============
   
   async getPosts(params?: {