fix: enqueue retry on RemnaWave API failure in all purchase flows (BUG-2, BUG-10)

Add remnawave_retry_queue.enqueue() calls in all 10 purchase error handlers
where RemnaWave API failure was caught and swallowed without scheduling a retry:
- cabinet purchase.py: purchase_tariff() and activate_trial() (2 places)
- subscription_purchase_service.py: miniapp purchase flow (1 place)
- tariff_purchase.py: custom, standard, daily, renewal, switch, daily-switch,
  and instant-switch flows (7 places)

app/cabinet/routes/subscription_modules/purchase.py

@@ -911,6 +911,12 @@ async def purchase_tariff(
                 )
         except Exception as remnawave_error:
             logger.error('Failed to sync subscription with RemnaWave', remnawave_error=remnawave_error)
+            from app.services.remnawave_retry_queue import remnawave_retry_queue
+            remnawave_retry_queue.enqueue(
+                subscription_id=subscription.id,
+                user_id=user.id,
+                action='create' if not subscription.remnawave_uuid else 'update',
+            )
 
         # Save cart for auto-renewal (not for daily tariffs - they have their own charging)
         if not is_daily_tariff:
@@ -1249,6 +1255,12 @@ async def activate_trial(
             await db.refresh(subscription)
     except Exception as e:
         logger.error('Failed to create RemnaWave user for trial', error=e)
+        from app.services.remnawave_retry_queue import remnawave_retry_queue
+        remnawave_retry_queue.enqueue(
+            subscription_id=subscription.id,
+            user_id=user.id,
+            action='create',
+        )
 
     # Send admin notification about trial activation
     try:

app/handlers/subscription/tariff_purchase.py

@@ -1078,6 +1078,12 @@ async def handle_custom_confirm(
                 )
         except Exception as e:
             logger.error('Ошибка обновления Remnawave', error=e)
+            from app.services.remnawave_retry_queue import remnawave_retry_queue
+            remnawave_retry_queue.enqueue(
+                subscription_id=subscription.id,
+                user_id=db_user.id,
+                action='create',
+            )
 
         # Создаем транзакцию
         await create_transaction(
@@ -1602,6 +1608,12 @@ async def confirm_tariff_purchase(
             )
     except Exception as e:
         logger.error('Ошибка обновления Remnawave', error=e)
+        from app.services.remnawave_retry_queue import remnawave_retry_queue
+        remnawave_retry_queue.enqueue(
+            subscription_id=subscription.id,
+            user_id=db_user.id,
+            action='create',
+        )
 
     # Создаем транзакцию
     try:
@@ -1875,6 +1887,12 @@ async def confirm_daily_tariff_purchase(
             )
     except Exception as e:
         logger.error('Ошибка обновления Remnawave', error=e)
+        from app.services.remnawave_retry_queue import remnawave_retry_queue
+        remnawave_retry_queue.enqueue(
+            subscription_id=subscription.id,
+            user_id=db_user.id,
+            action='create',
+        )
 
     # Создаем транзакцию
     await create_transaction(
@@ -2340,6 +2358,12 @@ async def confirm_tariff_extend(
                 )
         except Exception as e:
             logger.error('Ошибка обновления Remnawave', error=e)
+            from app.services.remnawave_retry_queue import remnawave_retry_queue
+            remnawave_retry_queue.enqueue(
+                subscription_id=subscription.id,
+                user_id=db_user.id,
+                action='create',
+            )
 
         # Создаем транзакцию
         await create_transaction(
@@ -2966,6 +2990,12 @@ async def confirm_tariff_switch(
                 )
         except Exception as e:
             logger.error('Ошибка обновления Remnawave при переключении тарифа', error=e)
+            from app.services.remnawave_retry_queue import remnawave_retry_queue
+            remnawave_retry_queue.enqueue(
+                subscription_id=subscription.id,
+                user_id=db_user.id,
+                action='create',
+            )
 
         # Гарантированный сброс устройств при смене тарифа
         await db.refresh(db_user)
@@ -3207,6 +3237,12 @@ async def confirm_daily_tariff_switch(
                 )
         except Exception as e:
             logger.error('Ошибка обновления Remnawave', error=e)
+            from app.services.remnawave_retry_queue import remnawave_retry_queue
+            remnawave_retry_queue.enqueue(
+                subscription_id=subscription.id,
+                user_id=db_user.id,
+                action='create',
+            )
 
         # Гарантированный сброс устройств при смене тарифа
         await db.refresh(db_user)
@@ -3894,6 +3930,12 @@ async def confirm_instant_switch(
                 )
         except Exception as e:
             logger.error('Ошибка обновления Remnawave при мгновенном переключении', error=e)
+            from app.services.remnawave_retry_queue import remnawave_retry_queue
+            remnawave_retry_queue.enqueue(
+                subscription_id=subscription.id,
+                user_id=db_user.id,
+                action='create',
+            )
 
         # Гарантированный сброс устройств при смене тарифа
         await db.refresh(db_user)

app/services/subscription_purchase_service.py

@@ -1188,6 +1188,12 @@ class MiniAppSubscriptionPurchaseService:
                 )
         except Exception as remnawave_error:  # pragma: no cover - defensive logging
             logger.error('Failed to sync subscription with RemnaWave', remnawave_error=remnawave_error)
+            from app.services.remnawave_retry_queue import remnawave_retry_queue
+            remnawave_retry_queue.enqueue(
+                subscription_id=subscription.id,
+                user_id=user.id,
+                action='create' if not getattr(subscription, 'remnawave_uuid', None) else 'update',
+            )
 
         transaction = await create_transaction(
             db=db,