first commit

web/src/app/core/services/admin.service.ts

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+import { Injectable, inject } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { environment } from '../../../environments/environment';
+import type { AppSettings, User } from '../../shared/models';
+
+@Injectable({ providedIn: 'root' })
+export class AdminService {
+  private readonly http = inject(HttpClient);
+
+  getSettings() {
+    return this.http.get<{ item: AppSettings }>(`${environment.apiBaseUrl}/admin/settings`);
+  }
+
+  updateSettings(payload: Partial<AppSettings>) {
+    return this.http.put<{ item: AppSettings }>(`${environment.apiBaseUrl}/admin/settings`, payload);
+  }
+
+  listUsers() {
+    return this.http.get<{ items: User[] }>(`${environment.apiBaseUrl}/admin/users`);
+  }
+
+  updateUser(id: string, payload: Partial<User>) {
+    return this.http.patch<{ item: User }>(`${environment.apiBaseUrl}/admin/users/${id}`, payload);
+  }
+
+  testSmtp(to: string) {
+    return this.http.post<{ message: string }>(`${environment.apiBaseUrl}/admin/test-smtp`, { to });
+  }
+}