fix(chat-banner): 관리자 배너 목록에 언어 표기를 추가한다

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

@@ -62,7 +62,13 @@ class AdminChatBannerController(
         val banners = bannerService.getActiveBanners(pageable)
         val response = ChatCharacterBannerListPageResponse(
             totalCount = banners.totalElements,
-            content = banners.content.map { ChatCharacterBannerResponse.from(it, imageHost) }
+            content = banners.content.map {
+                ChatCharacterBannerResponse.from(
+                    banner = it,
+                    imageHost = imageHost,
+                    appendLanguageToCharacterName = true
+                )
+            }
         )
 
         ApiResponse.ok(response)

src/main/kotlin/kr/co/vividnext/sodalive/admin/chat/dto/ChatCharacterBannerResponse.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.admin.chat.dto
 
 import kr.co.vividnext.sodalive.chat.character.ChatCharacterBanner
+import kr.co.vividnext.sodalive.i18n.Lang
 
 /**
  * 캐릭터 배너 응답 DTO
@@ -12,14 +13,30 @@ data class ChatCharacterBannerResponse(
     val characterName: String
 ) {
     companion object {
-        fun from(banner: ChatCharacterBanner, imageHost: String): ChatCharacterBannerResponse {
+        fun from(
+            banner: ChatCharacterBanner,
+            imageHost: String,
+            appendLanguageToCharacterName: Boolean = false
+        ): ChatCharacterBannerResponse {
             return ChatCharacterBannerResponse(
                 id = banner.id!!,
                 imagePath = "$imageHost/${banner.imagePath}",
                 characterId = banner.chatCharacter.id!!,
-                characterName = banner.chatCharacter.name
+                characterName = if (appendLanguageToCharacterName) {
+                    "${banner.chatCharacter.name} (${getLanguageLabel(banner.lang)})"
+                } else {
+                    banner.chatCharacter.name
+                }
             )
         }
+
+        private fun getLanguageLabel(lang: Lang): String {
+            return when (lang) {
+                Lang.KO -> "한국어"
+                Lang.EN -> "영어"
+                Lang.JA -> "일본어"
+            }
+        }
     }
 }