fix(content): 성인 콘텐츠 설정 동기화와 국가별 인증 분기를 적용한다

SodaLive/Sources/Live/Room/LiveRoomViewModel.swift

@@ -64,7 +64,7 @@ final class LiveRoomViewModel: NSObject, ObservableObject {
     @Published var isShowUserProfilePopup = false
     @Published var changeIsAdult = false {
         didSet {
-            if changeIsAdult && !UserDefaults.bool(forKey: .auth) {
+            if changeIsAdult && requiresAdultAuthenticationByCountry() {
                 agora.speakerMute(true)
             }
         }
@@ -653,7 +653,7 @@ final class LiveRoomViewModel: NSObject, ObservableObject {
                         getTotalDonationCan()
                         getTotalHeartCount()
                         
-                        if data.isAdult && !UserDefaults.bool(forKey: .auth) {
+                        if data.isAdult && requiresAdultAuthenticationByCountry() {
                             changeIsAdult = true
                         }
                         
@@ -697,6 +697,16 @@ final class LiveRoomViewModel: NSObject, ObservableObject {
         }
     }
 
+    private func requiresAdultAuthenticationByCountry() -> Bool {
+        let normalizedCountryCode = UserDefaults
+            .string(forKey: .countryCode)
+            .trimmingCharacters(in: .whitespacesAndNewlines)
+            .uppercased()
+        let isKoreanCountry = normalizedCountryCode.isEmpty || normalizedCountryCode == "KR"
+
+        return isKoreanCountry && !UserDefaults.bool(forKey: .auth)
+    }
+
     func toggleMute() {
         setMute(!isMute)
     }