[Task] 라운지 정보 조회 api 구현

### ISSUE
- Group: `server`
- Type: `feature`
- Detail: 라운지 정보 조회 api 구현

### TODO
1. [x] DB에서 정보를 잘 가져오는지 점검
2. [x] 정보조회 controller 작성
3. [x] postman을 통한 테스트 진행

### Estimated time
### `3h`

The issue concerns a server-side lounge-information API and mentions database retrieval, an information-query controller, and Postman testing, all marked complete. No files, endpoint, response schema, or runnable test are named; inspect the server API entry points and existing Postman checks to confirm the intended behavior and whether any implementation remains.

Written by the indexing model from the issue text.