Implement multi-card payment method management and enhance user notifications

- Added support for saving multiple payment methods, allowing users to bind and manage their cards effectively.
- Introduced a new paginated list view for displaying saved payment methods, improving user experience.
- Enhanced user notifications for successful binding of payment methods, including localized messages.
- Updated the database models and data access layer to accommodate multi-card functionality.
- Refactored existing payment method handlers to integrate with the new multi-card system.

locales/en.json

@@ -389,6 +389,7 @@
   "payment_method_last_tx": "Last transaction: {date}",
   "payment_method_tx_history_title": "📜 Transactions history",
   "payment_method_no_history": "No transactions history.",
+  "subscription_purchase_title": "Subscription purchase for {months} mo.",
   "subscription_tribute_notice": "Paid via Tribute. Renew using your Tribute link.",
   "subscription_tribute_notice_with_link": "Paid via Tribute. Renew: {link}",
   "subscription_autorenew_not_supported_for_tribute": "Auto-renew is handled by Tribute. Manage renewal in the Tribute app/link.",

locales/ru.json

@@ -388,6 +388,7 @@
   "payment_method_last_tx": "Последняя операция: {date}",
   "payment_method_tx_history_title": "📜 История операций",
   "payment_method_no_history": "История операций отсутствует.",
+  "subscription_purchase_title": "Покупка подписки на {months} мес.",
   "subscription_tribute_notice": "Оплачено через Tribute. Продление делайте по ссылке Tribute.",
   "subscription_tribute_notice_with_link": "Оплачено через Tribute. Продлить: {link}",
   "subscription_autorenew_not_supported_for_tribute": "Автопродление управляется Tribute. Управляйте продлением в приложении/ссылке Tribute.",