[Feature]게시글 삭제를 위한 Service, Controller 로직 구현

## 기능 설명
- 본인이 작성한 게시글을 삭제 할 수 있다.

### 삭제
- `/api/posts/delete`
- Method : DELETE
- Parameter
- required : path variable `UUID`
- Response:
- required : state, code, message

## 작업 내용
- [ ] 게시글 삭제를 위한 Service method 구현
- [ ] 게시글 삭제 API 구현을 위한 Controller method 구현

## 참고 자료

Locate the existing post Service and Controller entry points, then review how post ownership and API responses are handled. Implement the Service and Controller work for DELETE /api/posts/delete using the required UUID path variable; it is done when the author can delete their post and the response includes state, code, and message.

Written by the indexing model from the issue text.