[BE/Task] 매칭 관련

## ISSUE

- Group: server,
- Type: feature
- Detail:

## TODO

- [x] Job1 : 메인페이지 (모집글 전체보기) res정보전달
- [x] Job2 : 매칭 모집글 상세정보 req에 대해 res전달
- [x] Job3 : 매칭 모집글 DB 저장
- [x] Job4 : 매칭 신청하기 req에 대해 DB변경(matches테이블 soldout, orderuserid)
## Estimated time
`12h`

No file, test, or entry point is named, and the issue's four TODO items are already checked. Review the repository history and the current matching server/database implementation to confirm whether Jobs 1–4 were completed; done is a clearly documented remaining task or confirmation that the issue can be closed.

Written by the indexing model from the issue text.