feat(users): add updateAdmin endpoint and enhance role assignment

- Introduced `PATCH /admin/:uuid` endpoint for admin-specific user updates.
- Updated `update` logic to handle role assignment via `rbacService`.
- Refactored `findAll` method in repository for improved readability.

backend/src/users/users.service.ts

@@ -100,7 +100,14 @@ export class UsersService {
 
 	async update(uuid: string, data: UpdateUserDto) {
 		this.logger.log(`Updating user profile for ${uuid}`);
-		const result = await this.usersRepository.update(uuid, data);
+
+		const { role, ...userData } = data;
+
+		const result = await this.usersRepository.update(uuid, userData);
+
+		if (role) {
+			await this.rbacService.assignRoleToUser(uuid, role);
+		}
 
 		if (result[0]) {
 			await this.clearUserCache(result[0].username);