feat: add payment

lib/feature/shop/domain/entities/shop_entities.dart

@@ -6,6 +6,7 @@ class CoinPackage {
   final int vipDays;
   final int priceToman;
   final int bonusPct;
+  final String sku; // شناسه‌ی محصول در پنلِ فروشگاه (برای پرداختِ native)
   const CoinPackage({
     required this.id,
     required this.title,
@@ -13,6 +14,7 @@ class CoinPackage {
     required this.vipDays,
     required this.priceToman,
     required this.bonusPct,
+    this.sku = '',
   });
 }
 
@@ -21,11 +23,13 @@ class TicketPackage {
   final String title;
   final int tickets;
   final int priceToman;
+  final String sku;
   const TicketPackage({
     required this.id,
     required this.title,
     required this.tickets,
     required this.priceToman,
+    this.sku = '',
   });
 }
 
@@ -43,12 +47,14 @@ class Booster {
   final int multiplier;
   final int hours;
   final int priceToman;
+  final String sku;
   const Booster({
     required this.id,
     required this.title,
     required this.multiplier,
     required this.hours,
     required this.priceToman,
+    this.sku = '',
   });
 }
 
@@ -57,11 +63,13 @@ class VipPackage {
   final String title;
   final int months;
   final int priceToman;
+  final String sku;
   const VipPackage({
     required this.id,
     required this.title,
     required this.months,
     required this.priceToman,
+    this.sku = '',
   });
 }