Bazaar: subscriptions (10343/10344), dynamic price (discount codes on Bazaar), auto-renewal sync

- Purchase with paymentMethod=bazaar now works for subscription plans with a bazaar_sku (not only packs);
  response carries bazaarProductType. Migration subscription.0014 puts 10343/10344 on the 90/180-day plans.
- Verify asks Bazaar for the right product type (from the order) and stores validUntil (payment.0012).
- POST /api/payment/bazaar/orders/{id}/start: SKU, type, and an HS256 dynamic-price JWT when a discount
  code lowered the price (BAZAAR_DYNAMIC_PRICE_KEY); discount on Bazaar orders allowed only with that key
  and only before start.
- Auto-renewal: sync_bazaar_renewals re-asks Bazaar when the paid period is near its end (status page and
  the paywall via has_subscription_access); each new period becomes a paid order.
- Default BAZAAR_PACKAGE_NAME = com.tadrisino.math.app; health shows bazaarDynamicPrice.
979 tests green. No real Bazaar purchase or renewal tested.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

subscription/serializers.py

@@ -16,7 +16,7 @@ class PlanSerializer(serializers.Serializer):
     questionCredits = serializers.IntegerField(help_text='بسته: سوال‌هایی که به اعتبار اضافه می‌شود (منقضی نمی‌شود).')
     heartsDays = serializers.IntegerField(help_text='بسته: روزهای قلبِ نامحدودِ هدیه.')
     bazaarSku = serializers.CharField(
-        allow_blank=True, help_text='SKUِ همین بسته در کافه‌بازار؛ خالی یعنی در بازار خریدنی نیست.')
+        allow_blank=True, help_text='SKUِ همین پلن (بسته یا اشتراک) در کافه‌بازار؛ خالی یعنی در بازار خریدنی نیست.')
 
 
 class PlansListResponseSerializer(serializers.Serializer):
@@ -40,6 +40,9 @@ class PurchaseResponseSerializer(serializers.Serializer):
     bazaarSku = serializers.CharField(
         required=False, help_text='فقط بازار: SKUی که اپِ اندروید با Poolakey می‌خرد؛ '
                                   'developerPayload همان orderId باشد.')
+    bazaarProductType = serializers.ChoiceField(
+        choices=['inapp', 'subscription'], required=False,
+        help_text='فقط بازار: inapp (بسته؛ purchaseProduct و بعد consume) یا subscription (subscribeProduct، بی‌consume).')
 
 
 class SubscriptionStatusResponseSerializer(serializers.Serializer):