feat(chat-character): 캐릭터 등록시 파파고 언어 감지 API를 호출하여 languageCode를 기록하는 기능 추가

src/main/kotlin/kr/co/vividnext/sodalive/content/LanguageDetectEvent.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.content
 
 import kr.co.vividnext.sodalive.chat.character.comment.CharacterCommentRepository
+import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterRepository
 import kr.co.vividnext.sodalive.content.comment.AudioContentCommentRepository
 import kr.co.vividnext.sodalive.explorer.profile.CreatorCheersRepository
 import org.slf4j.LoggerFactory
@@ -23,6 +24,7 @@ import org.springframework.web.client.RestTemplate
 enum class LanguageDetectTargetType {
     CONTENT,
     COMMENT,
+    CHARACTER,
     CHARACTER_COMMENT,
     CREATOR_CHEERS
 }
@@ -41,6 +43,7 @@ data class PapagoLanguageDetectResponse(
 class LanguageDetectListener(
     private val audioContentRepository: AudioContentRepository,
     private val audioContentCommentRepository: AudioContentCommentRepository,
+    private val chatCharacterRepository: ChatCharacterRepository,
     private val characterCommentRepository: CharacterCommentRepository,
     private val creatorCheersRepository: CreatorCheersRepository,
 
@@ -69,11 +72,43 @@ class LanguageDetectListener(
         when (event.targetType) {
             LanguageDetectTargetType.CONTENT -> handleContentLanguageDetect(event)
             LanguageDetectTargetType.COMMENT -> handleCommentLanguageDetect(event)
+            LanguageDetectTargetType.CHARACTER -> handleCharacterLanguageDetect(event)
             LanguageDetectTargetType.CHARACTER_COMMENT -> handleCharacterCommentLanguageDetect(event)
             LanguageDetectTargetType.CREATOR_CHEERS -> handleCreatorCheersLanguageDetect(event)
         }
     }
 
+    private fun handleCharacterLanguageDetect(event: LanguageDetectEvent) {
+        val characterId = event.id
+
+        val character = chatCharacterRepository.findById(characterId).orElse(null)
+        if (character == null) {
+            log.warn("[PapagoLanguageDetect] ChatCharacter not found. characterId={}", characterId)
+            return
+        }
+
+        // 이미 언어 코드가 설정된 경우 호출하지 않음
+        if (!character.languageCode.isNullOrBlank()) {
+            log.debug(
+                "[PapagoLanguageDetect] languageCode already set. Skip language detection. characterId={}, languageCode={}",
+                characterId,
+                character.languageCode
+            )
+            return
+        }
+
+        val langCode = requestPapagoLanguageCode(event.query, characterId) ?: return
+
+        character.languageCode = langCode
+        chatCharacterRepository.save(character)
+
+        log.info(
+            "[PapagoLanguageDetect] languageCode updated from Papago. characterId={}, langCode={}",
+            characterId,
+            langCode
+        )
+    }
+
     private fun handleContentLanguageDetect(event: LanguageDetectEvent) {
         val contentId = event.id