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/repositories/users.repository.ts

@@ -64,7 +64,7 @@ export class UsersRepository {
 	}
 
 	async findAll(limit: number, offset: number) {
-		return await this.databaseService.db
+		const result = await this.databaseService.db
 			.select({
 				uuid: users.uuid,
 				username: users.username,
@@ -77,6 +77,8 @@ export class UsersRepository {
 			.from(users)
 			.limit(limit)
 			.offset(offset);
+
+		return result;
 	}
 
 	async findByUsername(username: string) {