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

src/main/kotlin/kr/co/vividnext/sodalive/admin/chat/character/AdminChatCharacterController.kt

@@ -13,8 +13,11 @@ import kr.co.vividnext.sodalive.chat.character.CharacterType
 import kr.co.vividnext.sodalive.chat.character.service.ChatCharacterService
 import kr.co.vividnext.sodalive.common.ApiResponse
 import kr.co.vividnext.sodalive.common.SodaException
+import kr.co.vividnext.sodalive.content.LanguageDetectEvent
+import kr.co.vividnext.sodalive.content.LanguageDetectTargetType
 import kr.co.vividnext.sodalive.utils.generateFileName
 import org.springframework.beans.factory.annotation.Value
+import org.springframework.context.ApplicationEventPublisher
 import org.springframework.http.HttpEntity
 import org.springframework.http.HttpHeaders
 import org.springframework.http.HttpMethod
@@ -40,6 +43,7 @@ class AdminChatCharacterController(
     private val adminService: AdminChatCharacterService,
     private val s3Uploader: S3Uploader,
     private val originalWorkService: AdminOriginalWorkService,
+    private val applicationEventPublisher: ApplicationEventPublisher,
 
     @Value("\${weraser.api-key}")
     private val apiKey: String,
@@ -165,6 +169,18 @@ class AdminChatCharacterController(
             originalWorkService.assignOneCharacter(request.originalWorkId, chatCharacter.id!!)
         }
 
+        // 5. 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
+        //    언어 감지에 사용할 내용은 chatCharacter.description 만 사용한다.
+        if (chatCharacter.languageCode.isNullOrBlank() && chatCharacter.description.isNotBlank()) {
+            applicationEventPublisher.publishEvent(
+                LanguageDetectEvent(
+                    id = chatCharacter.id!!,
+                    query = chatCharacter.description,
+                    targetType = LanguageDetectTargetType.CHARACTER
+                )
+            )
+        }
+
         ApiResponse.ok(null)
     }
 

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

@@ -22,6 +22,8 @@ class ChatCharacter(
     // 캐릭터 한 줄 소개
     var description: String,
 
+    var languageCode: String? = null,
+
     // AI 시스템 프롬프트
     @Column(columnDefinition = "TEXT", nullable = false)
     var systemPrompt: String,

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