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.Api/Telegram/TelegramNotifier.cs

@@ -106,9 +106,13 @@ internal sealed class TelegramNotifier(ITelegramBotClient botClient, IIdentitySe
         if (!link.IsLinked || link.TelegramUserId is not { } telegramUserId)
             return;
 
+        InlineKeyboardMarkup? keyboard = null;
+        if (!string.IsNullOrWhiteSpace(options.Value.PublicSiteUrl))
+            keyboard = new InlineKeyboardMarkup(new[] { InlineKeyboardButton.WithUrl("🌐 Открыть на сайте", options.Value.PublicSiteUrl) });
+
         try
         {
-            await botClient.SendMessage(telegramUserId, message, cancellationToken: cancellationToken);
+            await botClient.SendMessage(telegramUserId, message, replyMarkup: keyboard, cancellationToken: cancellationToken);
         }
         catch
         {