Add autorenew cancellation handler and logging for subscription service

- Implemented a new callback handler to allow users to cancel auto-renewal of their subscriptions via a webhook button.
- Added logging to track subscription status and auto-renew settings during webhook checks, improving monitoring and debugging capabilities.
- Enhanced user feedback with appropriate alerts for unsupported actions and confirmation of updates to subscription settings.

bot/services/panel_webhook_service.py

@@ -213,6 +213,13 @@ class PanelWebhookService:
                     async with self.async_session_factory() as session:
                         from db.dal import subscription_dal
                         sub = await subscription_dal.get_active_subscription_by_user_id(session, user_id)
+                        logging.info(
+                            "48h webhook check: user_id=%s sub_found=%s auto_renew=%s provider=%s",
+                            user_id,
+                            bool(sub),
+                            getattr(sub, 'auto_renew_enabled', None) if sub else None,
+                            getattr(sub, 'provider', None) if sub else None,
+                        )
                         if sub and sub.auto_renew_enabled and sub.provider != 'tribute':
                             cancel_kb = get_autorenew_cancel_keyboard(lang, self.i18n)
                             await self._send_message(