[refactor] 방 생성, 투표 생성 api 수정#183

seongjunnoh merged 14 commits intodevelopTHIP-TextHip/THIP-Server:developfrom

refactor/#181-modifiy-pre-apis-by-changing-jpa-entityTHIP-TextHip/THIP-Server:refactor/#181-modifiy-pre-apis-by-changing-jpa-entityCopy head branch name to clipboard