feat: Introduce admin user management API with user listing, retrieval, account activation/deactivation, and case-insensitive role validation.

Backend/src/controllers/UsermanagementController.ts

@@ -0,0 +1,31 @@
+import { Get, Body, Post, Route, Tags, SuccessResponse, Response, Example, Controller, Security, Request, Put,Path } from 'tsoa';
+import { UserManagementService } from '../services/usermanagement.service';
+import { ValidationError } from '../middleware/errorHandler';
+import { ListUsersResponse, GetUserResponse, ActivateAccountResponse } from '../types/usersmanagement.types';
+import { getUserByIdValidator } from '../validators/usermanagement.validator';
+
+@Route('api/admin/usermanagement')
+@Tags('Usermanagement')
+export class UserManagementController {
+
+    private userManagementService = new UserManagementService();
+
+    @Get('users')
+    @Security('jwt' , ['admin'])
+    @SuccessResponse('200', 'Users fetched successfully')
+    @Response('401', 'Invalid or expired token')
+    public async listUsers(): Promise<ListUsersResponse> {
+        return await this.userManagementService.listUsers();
+    }
+
+    @Get('users/{id}')
+    @Security('jwt' , ['admin'])
+    @SuccessResponse('200', 'User fetched successfully')
+    @Response('401', 'Invalid or expired token')
+    public async getUserById(@Path() id: number): Promise<GetUserResponse> {
+        const { error, value } = getUserByIdValidator.validate({ id });
+        if (error) throw new ValidationError(error.details[0].message);
+        return await this.userManagementService.getUserById(value.id);
+    }
+}
+