refactor: EnumUtils 제거 후 PostCategory에 직접 검증 메서드 추가#707

sukangpunch merged 2 commits intodevelopsolid-connection/solid-connect-server:developfrom

refactor/706-add-enum-name-validation-methodsolid-connection/solid-connect-server:refactor/706-add-enum-name-validation-methodCopy head branch name to clipboard