fix/#109: ObjectMapper추가시 발생하는 오류 해결 및 일반 회원가입 API 수정#111

Jinho622 merged 2 commits intodevHaRu-Developers/haru-springboot-api:devfrom

fix/#109-objectmapper-errorHaRu-Developers/haru-springboot-api:fix/#109-objectmapper-errorCopy head branch name to clipboard