번역 - 지원되지 않는 언어이면 API를 호출하지 않고 빈 값을 반환하도록 수정

src/main/kotlin/kr/co/vividnext/sodalive/i18n/translation/PapagoTranslationService.kt

@@ -24,7 +24,9 @@ class PapagoTranslationService(
             return TranslateResult(emptyList())
         }
 
-        validateLanguages(request.sourceLanguage, request.targetLanguage)
+        if (!validateLanguages(request.sourceLanguage, request.targetLanguage)) {
+            return TranslateResult(emptyList())
+        }
 
         val headers = HttpHeaders().apply {
             contentType = MediaType.APPLICATION_JSON
@@ -63,34 +65,20 @@ class PapagoTranslationService(
         return TranslateResult(translatedTexts)
     }
 
-    private fun validateLanguages(sourceLanguage: String, targetLanguage: String) {
-        requireSupportedLanguage(sourceLanguage)
-        requireSupportedLanguage(targetLanguage)
+    private fun validateLanguages(sourceLanguage: String, targetLanguage: String): Boolean {
+        return requireSupportedLanguage(sourceLanguage) && requireSupportedLanguage(targetLanguage)
     }
 
-    private fun requireSupportedLanguage(language: String) {
+    private fun requireSupportedLanguage(language: String): Boolean {
         val normalized = language.lowercase()
-        if (!SUPPORTED_LANGUAGE_CODES.contains(normalized)) {
-            throw IllegalArgumentException("지원하지 않는 언어 코드입니다: $language")
-        }
+        return SUPPORTED_LANGUAGE_CODES.contains(normalized)
     }
 
     companion object {
         private val SUPPORTED_LANGUAGE_CODES = setOf(
             "ko",
             "en",
-            "ja",
-            "zh-cn",
-            "zh-tw",
-            "es",
-            "fr",
-            "vi",
-            "th",
-            "id",
-            "de",
-            "ru",
-            "pt",
-            "it"
+            "ja"
         )
     }
 }