feat(be) : ë�서비스 단순 조회에 readonly 추가

Author: beekeeper24

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/service/ChatMessageService.kt

@@ -13,11 +13,13 @@ class ChatMessageService(
 ) {
     data class SendMessageReq(val senderId: Long, val content: String)
 
+    @Transactional(readOnly = true)
     fun getlistbefore(
         roomId: Long,
         limit: Int,
     ): List<ChatMessage> = msgRepository.findTop50ByRoomIdOrderByIdDesc(roomId).asReversed()
 
+    @Transactional(readOnly = true)
     fun getlistafter(
         roomId: Long,
         afterId: Long,

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatroom/service/ChatRoomService.kt

@@ -27,6 +27,7 @@ class ChatRoomService(
         )
     }
 
+    @Transactional(readOnly = true)
     fun get(roomId: Long): ChatRoom =
         roomRepository.findById(roomId)
             .orElseThrow { NoSuchElementException("room not found: $roomId") }