Implement billing status notification and enhance user management integration

- Added `NotifyBillingStatusChangedAsync` method to `IRealtimeNotifier` for notifying clients about changes in billing status.
- Updated `BillingConfigResumer` to call the new notification method after modifying billing configurations, ensuring users receive real-time updates.
- Enhanced `ListUsersQueryHandler` to include a `BillingPendingReview` property in `UserSummaryDto`, indicating if a user has a pending payment request awaiting confirmation.
- Refactored various command handlers to utilize `AdvisoryLock` for managing concurrent requests, preventing race conditions in billing operations.
- Updated tests to cover new notification behaviors and ensure proper functionality in billing status management.

frontend/src/features/support/TicketDetailDialog.tsx

@@ -100,7 +100,7 @@ export function TicketDetailDialog({ ticketId, onOpenChange }: { ticketId: strin
               ))}
             </div>
 
-            {data.status === 'Resolved' && (
+            {data.status === 'Resolved' && data.type === 'BugReport' && (
               <Button variant="outline" size="sm" disabled={reopenMutation.isPending} onClick={() => reopenMutation.mutate()}>
                 {t('support.reopen')}
               </Button>