feat(chat-character): 캐릭터 상세 조회 시 언어 코드 추가

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

@@ -171,6 +171,7 @@ class ChatCharacterController(
                 characterId = character.id!!,
                 name = character.name,
                 description = character.description,
+                languageCode = character.languageCode,
                 mbti = character.mbti,
                 gender = character.gender,
                 age = character.age,

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

@@ -7,6 +7,7 @@ data class CharacterDetailResponse(
     val characterId: Long,
     val name: String,
     val description: String,
+    val languageCode: String?,
     val mbti: String?,
     val gender: String?,
     val age: Int?,