fix：对齐金值的报名验证，商城入口逻辑对齐

lib/features/mall/application/mall_entry_promo_store.dart

@@ -0,0 +1,23 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../../../common/storage/storage_keys.dart';
+
+class MallEntryPromoStore {
+  const MallEntryPromoStore(this._preferences);
+
+  final SharedPreferences _preferences;
+
+  bool get hasOpenedMall =>
+      _preferences.getBool(storageMallEntryPromoOpened) ?? false;
+
+  bool get hasSeenHomeBadge =>
+      _preferences.getBool(storageMallHomeBadgeSeen) ?? false;
+
+  Future<void> markMallOpened() async {
+    await _preferences.setBool(storageMallEntryPromoOpened, true);
+  }
+
+  Future<void> markHomeBadgeSeen() async {
+    await _preferences.setBool(storageMallHomeBadgeSeen, true);
+  }
+}