- Implemented NotifyAdminsTicketReopenedAsync method in TelegramNotifier to notify admins when a ticket is reopened, including a link to the ticket on the public site. - Updated ITelegramNotifier interface to include the new notification method. - Modified ReopenTicketCommandHandler to invoke the new notification method after a ticket is reopened. - Enhanced unit tests for ReopenTicketCommandHandler to verify the notification functionality.