Add Telegram bot integration and enhance user management features

- Introduced Telegram.Bot package for bot functionality.
- Updated user management to include Telegram linking and blocking features.
- Enhanced activation request handling with notifications via Telegram.
- Added new database entities for Telegram link tokens and login requests.
- Implemented traffic synchronization for client stats in the XuiPanelGateway.
- Updated application structure to support new test projects and improved dependency injection for Telegram services.

backend/src/PnvPanel.Application/Admin/Apps/UpdateAppCommandHandler.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore;
+using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+
+namespace PnvPanel.Application.Admin.Apps;
+
+public sealed class UpdateAppCommandHandler(IAppDbContext dbContext) : ICommandHandler<UpdateAppCommand, Result<AdminAppDto>>
+{
+    public async Task<Result<AdminAppDto>> Handle(UpdateAppCommand command, CancellationToken cancellationToken)
+    {
+        var app = await dbContext.ClientApps.FirstOrDefaultAsync(a => a.Id == command.AppId, cancellationToken);
+        if (app is null)
+            return Result.Failure<AdminAppDto>(AppErrors.NotFound);
+
+        app.Update(
+            command.Name, new Uri(command.DownloadUrl, UriKind.Absolute), command.OperatingSystem,
+            command.Description, command.IconUrl, command.SortOrder, command.IsEnabled);
+
+        return Result.Success(AdminAppDto.FromDomain(app));
+    }
+}