feat(character-comment): 캐릭터 댓글/답글 API 및 응답 확장

- 댓글 리스트에 댓글 개수 추가

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentDto.kt

@@ -43,3 +43,12 @@ data class CharacterCommentRepliesResponse(
     val original: CharacterCommentResponse,
     val replies: List<CharacterReplyResponse>
 )
+
+// 댓글 리스트 조회 Response 컨테이너
+// - 전체 댓글 개수(totalCount)
+// - 댓글 목록(comments)
+
+data class CharacterCommentListResponse(
+    val totalCount: Int,
+    val comments: List<CharacterCommentResponse>
+)

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentService.kt

@@ -83,13 +83,18 @@ class CharacterCommentService(
     }
 
     @Transactional(readOnly = true)
-    fun listComments(imageHost: String, characterId: Long, limit: Int = 20): List<CharacterCommentResponse> {
+    fun listComments(imageHost: String, characterId: Long, limit: Int = 20): CharacterCommentListResponse {
         val pageable = PageRequest.of(0, limit)
         val comments = commentRepository.findByChatCharacter_IdAndIsActiveTrueAndParentIsNullOrderByCreatedAtDesc(
             characterId,
             pageable
         )
-        return comments.map { toCommentResponse(imageHost, it) }
+        val items = comments.map { toCommentResponse(imageHost, it) }
+        val total = getTotalCommentCount(characterId)
+        return CharacterCommentListResponse(
+            totalCount = total,
+            comments = items
+        )
     }
 
     @Transactional(readOnly = true)