Enhance Telegram bot integration and notification system

- Updated PnvBotUpdateHandler to improve message editing for login and activation requests, providing clearer feedback and removing lingering buttons.
- Modified TelegramNotifier to include an optional button linking to the public site in user notifications.
- Enhanced CloseTicketCommandHandler and ResolveTicketCommandHandler to notify users via Telegram when their support tickets are closed or resolved, improving user engagement.
- Updated ITelegramNotifier interface documentation to reflect the new functionality of including a site link in user notifications.

backend/src/PnvPanel.Application/Admin/Support/CloseTicketCommandHandler.cs

@@ -9,7 +9,8 @@ using PnvPanel.Domain.Support;
 
 namespace PnvPanel.Application.Admin.Support;
 
-public sealed class CloseTicketCommandHandler(IAppDbContext dbContext, IRealtimeNotifier notifier, ICurrentUser currentUser)
+public sealed class CloseTicketCommandHandler(
+    IAppDbContext dbContext, IRealtimeNotifier notifier, ITelegramNotifier telegramNotifier, ICurrentUser currentUser)
     : ICommandHandler<CloseTicketCommand, Result>
 {
     public async Task<Result> Handle(CloseTicketCommand command, CancellationToken cancellationToken)
@@ -30,6 +31,7 @@ public sealed class CloseTicketCommandHandler(IAppDbContext dbContext, IRealtime
             adminId, "TicketClosed", "SupportTicket", ticket.Id.ToString(), metadata: null, AuditSource.Web));
 
         await notifier.NotifyTicketUpdatedAsync(ticket.Id, ticket.UserId, cancellationToken);
+        await telegramNotifier.NotifyUserAsync(ticket.UserId, "🔒 Ваше обращение закрыто.", cancellationToken);
 
         return Result.Success();
     }

backend/src/PnvPanel.Application/Admin/Support/ResolveTicketCommandHandler.cs

@@ -9,7 +9,8 @@ using PnvPanel.Domain.Support;
 
 namespace PnvPanel.Application.Admin.Support;
 
-public sealed class ResolveTicketCommandHandler(IAppDbContext dbContext, IRealtimeNotifier notifier, ICurrentUser currentUser)
+public sealed class ResolveTicketCommandHandler(
+    IAppDbContext dbContext, IRealtimeNotifier notifier, ITelegramNotifier telegramNotifier, ICurrentUser currentUser)
     : ICommandHandler<ResolveTicketCommand, Result>
 {
     public async Task<Result> Handle(ResolveTicketCommand command, CancellationToken cancellationToken)
@@ -30,6 +31,7 @@ public sealed class ResolveTicketCommandHandler(IAppDbContext dbContext, IRealti
             adminId, "TicketResolved", "SupportTicket", ticket.Id.ToString(), metadata: null, AuditSource.Web));
 
         await notifier.NotifyTicketUpdatedAsync(ticket.Id, ticket.UserId, cancellationToken);
+        await telegramNotifier.NotifyUserAsync(ticket.UserId, "✅ Ваше обращение решено.", cancellationToken);
 
         return Result.Success();
     }

backend/src/PnvPanel.Application/Common/Interfaces/ITelegramNotifier.cs

@@ -10,7 +10,8 @@ public interface ITelegramNotifier
     Task NotifyAdminsActivationRequestedAsync(
         Guid requestId, string userName, string? comment, CancellationToken cancellationToken);
 
-    /// <summary>Личное сообщение пользователю, если у него привязан Telegram (иначе no-op).</summary>
+    /// <summary>Личное сообщение пользователю, если у него привязан Telegram (иначе no-op).
+    /// Если задан PublicSiteUrl — добавляет кнопку-ссылку на сайт.</summary>
     Task NotifyUserAsync(Guid userId, string message, CancellationToken cancellationToken);
 
     /// <summary>Баг-репорт/предложение — только кнопка-ссылка на сайт (переписка и картинки — там),