feat: reorganize admin settings with tabbed interface and documentation

- Reorganized admin settings into tabbed interface (General, Security, Payment Methods)
- Vertical tabs on desktop, horizontal scrollable on mobile
- Moved Payment Methods from separate menu to Settings tab
- Fixed admin profile reuse and dashboard blocking
- Fixed maintenance mode guard to use AppConfig model
- Added admin auto-redirect after login (admins → /admin, users → /)
- Reorganized documentation into docs/ folder structure
- Created comprehensive README and documentation index
- Added PWA and Web Push notifications to to-do list

apps/api/dist/admin/admin-users.service.d.ts

@@ -170,4 +170,32 @@ export declare class AdminUsersService {
         activeSubscriptions: number;
         suspendedUsers: number;
     }>;
+    create(data: {
+        email: string;
+        password: string;
+        name?: string;
+        role?: string;
+    }): Promise<{
+        id: string;
+        email: string;
+        createdAt: Date;
+        emailVerified: boolean;
+        name: string | null;
+        role: string;
+    }>;
+    update(id: string, data: {
+        email?: string;
+        name?: string;
+        role?: string;
+    }): Promise<{
+        id: string;
+        email: string;
+        createdAt: Date;
+        emailVerified: boolean;
+        name: string | null;
+        role: string;
+    }>;
+    delete(id: string): Promise<{
+        message: string;
+    }>;
 }