fix(admin-app): 消除UI层硬编码中文，补充i18n keys（zh/en/ja）

- 新增 29 个 i18n keys 到三语言文件（credit_score_unit, finance_confirm_withdraw,
  redemption_failed, store_no_stores, settings_confirm_logout, coupon_status_* 等）
- 修复 10 个页面中的硬编码中文字符串：
  credit_page: 分数单位、权重、空状态
  finance_page: 提现对话框、SnackBar、时间格式、空状态
  redemption_page: 错误消息、批量结果、空状态、时间格式
  store_management_page: 门店/员工空状态
  settings_page: 退出确认对话框、层级权益描述
  coupon_list_page: 状态徽章（在售/待审/售罄/下架）
  coupon_detail_page: 面值/发行价标签
  ai_agent_page: 错误回复消息
  issuer_dashboard_page: 信用分单位
- 剩余中文仅存于 /// 注释和 mock 数据数组中（将被真实API数据替换）

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/admin-app/lib/app/i18n/app_localizations.dart

@@ -552,6 +552,37 @@ class AppLocalizations {
     'settings_about': '关于企业券信',
     'settings_logout': '退出登录',
 
+    // ── Hardcoded string fixes ──
+    'credit_score_unit': '分',
+    'credit_no_factors': '暂无评分因子',
+    'credit_no_suggestions': '暂无建议',
+    'finance_confirm_withdraw': '确认提现',
+    'finance_withdraw_amount': '提现金额',
+    'finance_withdraw_submitted': '提现申请已提交',
+    'finance_withdraw_failed': '提现失败',
+    'finance_no_transactions': '暂无交易记录',
+    'finance_today': '今天',
+    'finance_yesterday': '昨天',
+    'finance_no_reports': '暂无对账报表',
+    'redemption_failed': '核销失败',
+    'redemption_batch_failed': '批量核销失败',
+    'redemption_no_records': '暂无核销记录',
+    'redemption_minutes_ago': '分钟前',
+    'redemption_hours_ago': '小时前',
+    'redemption_days_ago': '天前',
+    'store_no_stores': '暂无门店',
+    'store_no_employees': '暂无员工',
+    'settings_confirm_logout': '确认退出',
+    'settings_confirm_logout_desc': '确定要退出登录吗？',
+    'settings_tier_benefits': '手续费率 1.2% · 高级数据分析',
+    'coupon_status_active': '在售中',
+    'coupon_status_pending': '待审核',
+    'coupon_status_sold_out': '已售罄',
+    'coupon_status_delisted': '已下架',
+    'ai_agent_error_reply': '抱歉，暂时无法回复。请稍后重试。',
+    'coupon_detail_type_info': '面值',
+    'coupon_detail_issue_price_label': '发行价',
+
     // ── AI Suggestion Card ──
     'ai_suggestion_label': 'AI 建议',
     'ai_suggestion_dismiss': '忽略',
@@ -1117,6 +1148,37 @@ class AppLocalizations {
     'settings_about': 'About Genex',
     'settings_logout': 'Sign Out',
 
+    // ── Hardcoded string fixes ──
+    'credit_score_unit': 'pts',
+    'credit_no_factors': 'No rating factors',
+    'credit_no_suggestions': 'No suggestions',
+    'finance_confirm_withdraw': 'Confirm Withdrawal',
+    'finance_withdraw_amount': 'Withdrawal Amount',
+    'finance_withdraw_submitted': 'Withdrawal request submitted',
+    'finance_withdraw_failed': 'Withdrawal failed',
+    'finance_no_transactions': 'No transactions',
+    'finance_today': 'Today',
+    'finance_yesterday': 'Yesterday',
+    'finance_no_reports': 'No reports',
+    'redemption_failed': 'Redemption failed',
+    'redemption_batch_failed': 'Batch redemption failed',
+    'redemption_no_records': 'No redemption records',
+    'redemption_minutes_ago': 'm ago',
+    'redemption_hours_ago': 'h ago',
+    'redemption_days_ago': 'd ago',
+    'store_no_stores': 'No stores',
+    'store_no_employees': 'No employees',
+    'settings_confirm_logout': 'Confirm Logout',
+    'settings_confirm_logout_desc': 'Are you sure you want to sign out?',
+    'settings_tier_benefits': 'Fee rate 1.2% · Advanced analytics',
+    'coupon_status_active': 'On Sale',
+    'coupon_status_pending': 'Pending',
+    'coupon_status_sold_out': 'Sold Out',
+    'coupon_status_delisted': 'Delisted',
+    'ai_agent_error_reply': 'Sorry, unable to respond. Please try again later.',
+    'coupon_detail_type_info': 'Face Value',
+    'coupon_detail_issue_price_label': 'Issue Price',
+
     // ── AI Suggestion Card ──
     'ai_suggestion_label': 'AI Suggestion',
     'ai_suggestion_dismiss': 'Dismiss',
@@ -1682,6 +1744,37 @@ class AppLocalizations {
     'settings_about': 'Genex について',
     'settings_logout': 'ログアウト',
 
+    // ── Hardcoded string fixes ──
+    'credit_score_unit': '点',
+    'credit_no_factors': '評価因子なし',
+    'credit_no_suggestions': '提案なし',
+    'finance_confirm_withdraw': '出金確認',
+    'finance_withdraw_amount': '出金金額',
+    'finance_withdraw_submitted': '出金申請が送信されました',
+    'finance_withdraw_failed': '出金に失敗しました',
+    'finance_no_transactions': '取引記録なし',
+    'finance_today': '本日',
+    'finance_yesterday': '昨日',
+    'finance_no_reports': 'レポートなし',
+    'redemption_failed': '検証に失敗しました',
+    'redemption_batch_failed': '一括検証に失敗しました',
+    'redemption_no_records': '検証記録なし',
+    'redemption_minutes_ago': '分前',
+    'redemption_hours_ago': '時間前',
+    'redemption_days_ago': '日前',
+    'store_no_stores': '店舗なし',
+    'store_no_employees': 'スタッフなし',
+    'settings_confirm_logout': 'ログアウト確認',
+    'settings_confirm_logout_desc': 'ログアウトしますか？',
+    'settings_tier_benefits': '手数料率 1.2% · 高度データ分析',
+    'coupon_status_active': '販売中',
+    'coupon_status_pending': '審査中',
+    'coupon_status_sold_out': '完売',
+    'coupon_status_delisted': '非公開',
+    'ai_agent_error_reply': '申し訳ございません、現在応答できません。後でもう一度お試しください。',
+    'coupon_detail_type_info': '額面',
+    'coupon_detail_issue_price_label': '発行価格',
+
     // ── AI Suggestion Card ──
     'ai_suggestion_label': 'AI 提案',
     'ai_suggestion_dismiss': '無視',

frontend/admin-app/lib/features/ai_agent/presentation/pages/ai_agent_page.dart

@@ -253,7 +253,7 @@ class _AiAgentPageState extends State<AiAgentPage> {
       setState(() {
         _messages.add(_ChatMessage(
           isAi: true,
-          text: '抱歉，暂时无法回复。请稍后重试。',
+          text: context.t('ai_agent_error_reply'),
         ));
         _isSending = false;
       });

frontend/admin-app/lib/features/coupon_management/presentation/pages/coupon_detail_page.dart

@@ -173,7 +173,7 @@ class _IssuerCouponDetailPageState extends State<IssuerCouponDetailPage> {
           ),
           const SizedBox(height: 6),
           Text(
-            '${coupon.couponType} · 面值 \$${coupon.faceValue.toStringAsFixed(0)} · 发行价 \$${coupon.currentPrice.toStringAsFixed(2)}',
+            '${coupon.couponType} · ${context.t('coupon_detail_type_info')} \$${coupon.faceValue.toStringAsFixed(0)} · ${context.t('coupon_detail_issue_price_label')} \$${coupon.currentPrice.toStringAsFixed(2)}',
             style: TextStyle(fontSize: 13, color: Colors.white.withValues(alpha: 0.8)),
           ),
           const SizedBox(height: 16),

frontend/admin-app/lib/features/coupon_management/presentation/pages/coupon_list_page.dart

@@ -323,19 +323,19 @@ class _CouponListPageState extends State<CouponListPage> {
     switch (status) {
       case 'active':
         color = AppColors.success;
-        label = '在售中';
+        label = context.t('coupon_status_active');
         break;
       case 'pending':
         color = AppColors.warning;
-        label = '待审核';
+        label = context.t('coupon_status_pending');
         break;
       case 'sold_out':
         color = AppColors.info;
-        label = '已售罄';
+        label = context.t('coupon_status_sold_out');
         break;
       case 'delisted':
         color = AppColors.textTertiary;
-        label = '已下架';
+        label = context.t('coupon_status_delisted');
         break;
       default:
         color = AppColors.textTertiary;

frontend/admin-app/lib/features/credit/presentation/pages/credit_page.dart

@@ -128,7 +128,7 @@ class _CreditPageState extends State<CreditPage> {
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: [
                   Text(credit.grade, style: const TextStyle(fontSize: 32, fontWeight: FontWeight.w700, color: Colors.white)),
-                  Text('${credit.score}分', style: const TextStyle(fontSize: 14, color: Colors.white70)),
+                  Text('${credit.score}${context.t('credit_score_unit')}', style: const TextStyle(fontSize: 14, color: Colors.white70)),
                 ],
               ),
             ),
@@ -171,7 +171,7 @@ class _CreditPageState extends State<CreditPage> {
                     children: [
                       Text(f.name, style: const TextStyle(fontSize: 13)),
                       Text(
-                        '${f.score.toInt()}分 (权重${(f.weight * 100).toInt()}%)',
+                        '${f.score.toInt()}${context.t('credit_score_unit')} (${(f.weight * 100).toInt()}%)',
                         style: const TextStyle(fontSize: 12, color: AppColors.textSecondary),
                       ),
                     ],
@@ -193,7 +193,7 @@ class _CreditPageState extends State<CreditPage> {
           if (factors.isEmpty)
             const Padding(
               padding: EdgeInsets.all(16),
-              child: Center(child: Text('暂无评分因子', style: TextStyle(color: AppColors.textTertiary))),
+              child: Center(child: Text(context.t('credit_no_factors'), style: const TextStyle(color: AppColors.textTertiary))),
             ),
         ],
       ),
@@ -285,8 +285,8 @@ class _CreditPageState extends State<CreditPage> {
               color: AppColors.primarySurface,
               borderRadius: BorderRadius.circular(10),
             ),
-            child: const Center(
+            child: Center(
-              child: Text('暂无建议', style: TextStyle(color: AppColors.textSecondary)),
+              child: Text(context.t('credit_no_suggestions'), style: const TextStyle(color: AppColors.textSecondary)),
             ),
           )
         else

frontend/admin-app/lib/features/dashboard/presentation/pages/issuer_dashboard_page.dart

@@ -355,7 +355,7 @@ class _IssuerDashboardPageState extends State<IssuerDashboardPage> {
                   children: [
                     Text(context.t('dashboard_credit_rating'), style: const TextStyle(fontSize: 15, fontWeight: FontWeight.w600)),
                     Text(
-                      stats != null ? '${context.t('dashboard_credit_gap')} (${stats.creditScore}分)' : context.t('dashboard_credit_gap'),
+                      stats != null ? '${context.t('dashboard_credit_gap')} (${stats.creditScore}${context.t('credit_score_unit')})' : context.t('dashboard_credit_gap'),
                       style: const TextStyle(fontSize: 12, color: AppColors.textTertiary),
                     ),
                   ],

frontend/admin-app/lib/features/finance/presentation/pages/finance_page.dart

@@ -111,8 +111,8 @@ class _OverviewTabState extends State<_OverviewTab> {
     final confirmed = await showDialog<bool>(
       context: context,
       builder: (ctx) => AlertDialog(
-        title: const Text('确认提现'),
+        title: Text(context.t('finance_confirm_withdraw')),
-        content: Text('提现金额: \$${_balance!.withdrawable.toStringAsFixed(2)}'),
+        content: Text('${context.t('finance_withdraw_amount')}: \$${_balance!.withdrawable.toStringAsFixed(2)}'),
         actions: [
           TextButton(onPressed: () => Navigator.pop(ctx, false), child: Text(context.t('cancel'))),
           ElevatedButton(onPressed: () => Navigator.pop(ctx, true), child: Text(context.t('confirm'))),
@@ -126,14 +126,14 @@ class _OverviewTabState extends State<_OverviewTab> {
       await _financeService.withdraw(_balance!.withdrawable);
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('提现申请已提交'), backgroundColor: AppColors.success),
+        SnackBar(content: Text(context.t('finance_withdraw_submitted')), backgroundColor: AppColors.success),
       );
       _loadData();
     } catch (e) {
       debugPrint('[FinancePage] withdraw error: $e');
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('提现失败: $e'), backgroundColor: AppColors.error),
+        SnackBar(content: Text('${context.t('finance_withdraw_failed')}: $e'), backgroundColor: AppColors.error),
       );
     }
   }
@@ -397,8 +397,8 @@ class _TransactionDetailTabState extends State<_TransactionDetailTab> {
     }
 
     if (_transactions.isEmpty) {
-      return const Center(
+      return Center(
-        child: Text('暂无交易记录', style: TextStyle(color: AppColors.textSecondary)),
+        child: Text(context.t('finance_no_transactions'), style: const TextStyle(color: AppColors.textSecondary)),
       );
     }
 
@@ -433,10 +433,10 @@ class _TransactionDetailTabState extends State<_TransactionDetailTab> {
     final now = DateTime.now();
     final isToday = dt.year == now.year && dt.month == now.month && dt.day == now.day;
     final timeStr = '${dt.hour.toString().padLeft(2, '0')}:${dt.minute.toString().padLeft(2, '0')}';
-    if (isToday) return '今天 $timeStr';
+    if (isToday) return '${context.t('finance_today')} $timeStr';
     final yesterday = now.subtract(const Duration(days: 1));
     final isYesterday = dt.year == yesterday.year && dt.month == yesterday.month && dt.day == yesterday.day;
-    if (isYesterday) return '昨天 $timeStr';
+    if (isYesterday) return '${context.t('finance_yesterday')} $timeStr';
     return '${dt.month}/${dt.day} $timeStr';
   }
 }
@@ -527,17 +527,17 @@ class _ReconciliationTabState extends State<_ReconciliationTab> {
           const SizedBox(height: 20),
 
           if (reports.isEmpty)
-            const Center(
+            Center(
               child: Padding(
-                padding: EdgeInsets.all(32),
+                padding: const EdgeInsets.all(32),
-                child: Text('暂无对账报表', style: TextStyle(color: AppColors.textSecondary)),
+                child: Text(context.t('finance_no_reports'), style: const TextStyle(color: AppColors.textSecondary)),
               ),
             )
           else
             ...reports.map((r) {
               final title = r['title'] ?? '';
               final summary = r['summary'] ?? '';
-              final status = r['status'] ?? '已生成';
+              final status = r['status'] ?? '--';
               return Container(
                 margin: const EdgeInsets.only(bottom: 12),
                 padding: const EdgeInsets.all(16),

frontend/admin-app/lib/features/redemption/presentation/pages/redemption_page.dart

@@ -94,7 +94,7 @@ class _ScanRedeemTabState extends State<_ScanRedeemTab> {
       if (!mounted) return;
       setState(() => _isRedeeming = false);
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('核销失败: $e'), backgroundColor: AppColors.error),
+        SnackBar(content: Text('${context.t('redemption_failed')}: $e'), backgroundColor: AppColors.error),
       );
     }
   }
@@ -196,7 +196,7 @@ class _ScanRedeemTabState extends State<_ScanRedeemTab> {
                                 _loadTodayStats();
                                 ScaffoldMessenger.of(context).showSnackBar(
                                   SnackBar(
-                                    content: Text('成功: ${result.successCount}, 失败: ${result.failCount}'),
+                                    content: Text('${result.successCount} / ${result.failCount} (${context.t('redemption_failed')})'),
                                     backgroundColor: result.failCount == 0 ? AppColors.success : AppColors.warning,
                                   ),
                                 );
@@ -205,7 +205,7 @@ class _ScanRedeemTabState extends State<_ScanRedeemTab> {
                                 setLocalState(() => isBatching = false);
                                 if (mounted) {
                                   ScaffoldMessenger.of(context).showSnackBar(
-                                    SnackBar(content: Text('批量核销失败: $e'), backgroundColor: AppColors.error),
+                                    SnackBar(content: Text('${context.t('redemption_batch_failed')}: $e'), backgroundColor: AppColors.error),
                                   );
                                 }
                               }
@@ -413,8 +413,8 @@ class _RedeemHistoryTabState extends State<_RedeemHistoryTab> {
     }
 
     if (_records.isEmpty) {
-      return const Center(
+      return Center(
-        child: Text('暂无核销记录', style: TextStyle(color: AppColors.textSecondary)),
+        child: Text(context.t('redemption_no_records'), style: const TextStyle(color: AppColors.textSecondary)),
       );
     }
 
@@ -460,9 +460,9 @@ class _RedeemHistoryTabState extends State<_RedeemHistoryTab> {
   String _formatTime(DateTime dt) {
     final now = DateTime.now();
     final diff = now.difference(dt);
-    if (diff.inMinutes < 60) return '${diff.inMinutes}分钟前';
+    if (diff.inMinutes < 60) return '${diff.inMinutes}${context.t('redemption_minutes_ago')}';
-    if (diff.inHours < 24) return '${diff.inHours}小时前';
+    if (diff.inHours < 24) return '${diff.inHours}${context.t('redemption_hours_ago')}';
-    if (diff.inDays < 7) return '${diff.inDays}天前';
+    if (diff.inDays < 7) return '${diff.inDays}${context.t('redemption_days_ago')}';
     return '${dt.month}/${dt.day}';
   }
 }

frontend/admin-app/lib/features/settings/presentation/pages/settings_page.dart

@@ -60,8 +60,8 @@ class _SettingsPageState extends State<SettingsPage> {
     final confirmed = await showDialog<bool>(
       context: context,
       builder: (ctx) => AlertDialog(
-        title: const Text('确认退出'),
+        title: Text(context.t('settings_confirm_logout')),
-        content: const Text('确定要退出登录吗？'),
+        content: Text(context.t('settings_confirm_logout_desc')),
         actions: [
           TextButton(onPressed: () => Navigator.pop(ctx, false), child: Text(context.t('cancel'))),
           ElevatedButton(
@@ -272,7 +272,7 @@ class _SettingsPageState extends State<SettingsPage> {
                       : context.t('settings_gold_issuer'),
                   style: const TextStyle(fontSize: 15, fontWeight: FontWeight.w700, color: AppColors.tierGold),
                 ),
-                const Text('手续费率 1.2% · 高级数据分析', style: TextStyle(fontSize: 12, color: AppColors.textSecondary)),
+                Text(context.t('settings_tier_benefits'), style: const TextStyle(fontSize: 12, color: AppColors.textSecondary)),
               ],
             ),
           ),

frontend/admin-app/lib/features/store_management/presentation/pages/store_management_page.dart

@@ -107,8 +107,8 @@ class _StoreListTabState extends State<_StoreListTab> {
     }
 
     if (_stores.isEmpty) {
-      return const Center(
+      return Center(
-        child: Text('暂无门店', style: TextStyle(color: AppColors.textSecondary)),
+        child: Text(context.t('store_no_stores'), style: const TextStyle(color: AppColors.textSecondary)),
       );
     }
 
@@ -265,8 +265,8 @@ class _EmployeeListTabState extends State<_EmployeeListTab> {
     }
 
     if (_employees.isEmpty) {
-      return const Center(
+      return Center(
-        child: Text('暂无员工', style: TextStyle(color: AppColors.textSecondary)),
+        child: Text(context.t('store_no_employees'), style: const TextStyle(color: AppColors.textSecondary)),
       );
     }