fix(content): 크리에이터 관리자 시리즈 상세 조회 예외를 수정한다

src/main/kotlin/kr/co/vividnext/sodalive/creator/admin/content/series/CreatorAdminContentSeriesService.kt

@@ -26,6 +26,7 @@ import org.springframework.transaction.annotation.Transactional
 import org.springframework.web.multipart.MultipartFile
 
 @Service
+@Transactional(readOnly = true)
 class CreatorAdminContentSeriesService(
     private val repository: CreatorAdminContentSeriesRepository,
     private val genreRepository: CreatorAdminContentSeriesGenreRepository,