offline 스코프 제거, rp_claims 값 표준화

userfront/lib/features/auth/domain/consent_scope_policy.dart

@@ -0,0 +1,11 @@
+bool isRefreshTokenScopeAlias(String scope) {
+  final normalized = scope.trim().toLowerCase();
+  return normalized == 'offline' || normalized == 'offline_access';
+}
+
+List<String> filterConsentScopes(Iterable<String> scopes) {
+  return scopes
+      .map((scope) => scope.trim())
+      .where((scope) => scope.isNotEmpty && !isRefreshTokenScopeAlias(scope))
+      .toList(growable: false);
+}

userfront/lib/features/auth/presentation/consent_screen.dart

@@ -6,6 +6,7 @@ import 'package:userfront/core/services/auth_proxy_service.dart';
 import 'package:userfront/core/services/web_window.dart';
 import 'package:userfront/core/ui/toast_service.dart';
 import 'package:userfront/features/auth/domain/consent_error_routing.dart';
+import 'package:userfront/features/auth/domain/consent_scope_policy.dart';
 
 class ConsentScreen extends StatefulWidget {
   final String consentChallenge;
@@ -53,10 +54,6 @@ class _ConsentScreenState extends State<ConsentScreen> {
         'msg.userfront.consent.scope.email',
         fallback: 'Email address (account identification and notifications)',
       ),
-      'offline_access': tr(
-        'msg.userfront.consent.scope.offline_access',
-        fallback: 'Offline access (keep signed in)',
-      ),
       'phone': tr(
         'msg.userfront.consent.scope.phone',
         fallback: 'Phone number (identity verification and notifications)',
@@ -80,9 +77,6 @@ class _ConsentScreenState extends State<ConsentScreen> {
   }
 
   String _scopeDisplayLabel(String scope) {
-    if (scope == 'offline_access') {
-      return 'offline access';
-    }
     return scope.replaceAll('_', ' ');
   }
 
@@ -138,9 +132,11 @@ class _ConsentScreenState extends State<ConsentScreen> {
       }
 
       // 초기 선택 상태 설정: 모든 요청된 스코프를 기본 선택
-      final requestedScopes =
-          (info['requested_scope'] as List<dynamic>?)?.cast<String>() ?? [];
+      final requestedScopes = filterConsentScopes(
+        (info['requested_scope'] as List<dynamic>?)?.cast<String>() ?? [],
+      );
       _selectedScopes.addAll(requestedScopes);
+      info['requested_scope'] = requestedScopes;
 
       setState(() {
         _consentInfo = info;
@@ -299,9 +295,10 @@ class _ConsentScreenState extends State<ConsentScreen> {
               ? clientId
               : tr('msg.userfront.consent.client_unknown'));
     final clientLogo = _consentInfo?['client']?['logo_uri'];
-    final requestedScopes =
-        (_consentInfo?['requested_scope'] as List<dynamic>?)?.cast<String>() ??
-        [];
+    final requestedScopes = filterConsentScopes(
+      (_consentInfo?['requested_scope'] as List<dynamic>?)?.cast<String>() ??
+          [],
+    );
 
     return SingleChildScrollView(
       child: Container(

userfront/lib/i18n_data.dart

@@ -597,7 +597,6 @@ const Map<String, String> koStrings = {
   "msg.userfront.consent.missing_redirect": "동의가 처리되었으나 리다이렉트 URL을 받지 못했습니다.",
   "msg.userfront.consent.redirect_notice": "동의 후 자동으로 서비스로 이동합니다.",
   "msg.userfront.consent.scope.email": "이메일 주소 (계정 식별 및 알림 용도)",
-  "msg.userfront.consent.scope.offline_access": "오프라인 접근 (로그인 유지)",
   "msg.userfront.consent.scope.openid": "OpenID 인증 정보 (로그인 상태 확인)",
   "msg.userfront.consent.scope.phone": "휴대폰 번호 (본인 인증 및 알림)",
   "msg.userfront.consent.scope.profile": "기본 프로필 정보 (이름, 사용자 식별자)",
@@ -2982,8 +2981,6 @@ const Map<String, String> enStrings = {
       "After consent, you will be redirected automatically.",
   "msg.userfront.consent.scope.email":
       "Email address (account identification and notifications)",
-  "msg.userfront.consent.scope.offline_access":
-      "Offline access (keep signed in)",
   "msg.userfront.consent.scope.openid":
       "OpenID authentication information (signin session check)",
   "msg.userfront.consent.scope.phone":