fix(client): 订单管理打开自动重拉列表 + 订单时间 UTC 显示转本地时区

- 打开订单管理 tab 时 invalidate 重建列表 provider（保留旧值展示不闪屏），
  新下单/已删单不再需要手动刷新才同步
- license.dart 全部时间字段解析后 toLocal()（同 session.dart 惯例），
  修复订单创建/支付时间显示为 UTC（慢 8 小时）

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

client/lib/models/license.dart

@@ -26,7 +26,7 @@ class LicenseInfo {
       maxDevices: (json['max_devices'] as num?)?.toInt() ??
           AppConstants.defaultMaxDevices,
       expiresAt: json['expires_at'] != null
-          ? DateTime.tryParse(json['expires_at'] as String)
+          ? DateTime.tryParse(json['expires_at'] as String)?.toLocal()
           : null,
       phase: json['phase'] as String? ?? 'normal',
     );
@@ -139,10 +139,10 @@ class PurchaseStatusInfo {
         currency: json['currency'] as String? ?? 'CNY',
         amount: json['amount'] as String? ?? '',
         paidAt: json['paid_at'] != null
-            ? DateTime.tryParse(json['paid_at'] as String)
+            ? DateTime.tryParse(json['paid_at'] as String)?.toLocal()
             : null,
         expiresAt: json['expires_at'] != null
-            ? DateTime.tryParse(json['expires_at'] as String)
+            ? DateTime.tryParse(json['expires_at'] as String)?.toLocal()
             : null,
       );
 }
@@ -191,14 +191,15 @@ class PurchaseRecord {
         status: json['status'] as String? ?? 'pending',
         payUrl: json['pay_url'] as String? ?? '',
         userName: json['user_name'] as String? ?? '',
+        // 服务端时间为 UTC（RFC3339 Z），展示前转本地时区（同 session.dart 惯例）
         createdAt: json['created_at'] != null
-            ? DateTime.tryParse(json['created_at'] as String)
+            ? DateTime.tryParse(json['created_at'] as String)?.toLocal()
             : null,
         paidAt: json['paid_at'] != null
-            ? DateTime.tryParse(json['paid_at'] as String)
+            ? DateTime.tryParse(json['paid_at'] as String)?.toLocal()
             : null,
         renewedTo: json['renewed_to'] != null
-            ? DateTime.tryParse(json['renewed_to'] as String)
+            ? DateTime.tryParse(json['renewed_to'] as String)?.toLocal()
             : null,
       );
 }