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/tests/PnvPanel.Application.Tests/Activation/ApproveActivationCommandHandlerTests.cs

@@ -0,0 +1,94 @@
+using NSubstitute;
+using PnvPanel.Application.Activation;
+using PnvPanel.Application.Admin.Activation;
+using PnvPanel.Application.Auth;
+using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Common.Models;
+using PnvPanel.Application.Tests.TestSupport;
+using PnvPanel.Domain.Activation;
+using Xunit;
+
+namespace PnvPanel.Application.Tests.Activation;
+
+public class ApproveActivationCommandHandlerTests
+{
+    private readonly IIdentityService _identityService = Substitute.For<IIdentityService>();
+    private readonly IRealtimeNotifier _notifier = Substitute.For<IRealtimeNotifier>();
+    private readonly ICurrentUser _currentUser = Substitute.For<ICurrentUser>();
+
+    [Fact]
+    public async Task Handle_WhenPending_ApprovesActivatesUserAndNotifies()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var adminId = Guid.NewGuid();
+        var request = ActivationRequest.Create(Guid.NewGuid(), "please");
+        dbContext.ActivationRequests.Add(request);
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        _currentUser.UserId.Returns(adminId);
+        _identityService.ActivateUserAsync(request.UserId, adminId, Arg.Any<CancellationToken>()).Returns(Result.Success());
+
+        var handler = new ApproveActivationCommandHandler(dbContext, _identityService, _notifier, _currentUser);
+
+        var result = await handler.Handle(new ApproveActivationCommand(request.Id), CancellationToken.None);
+
+        Assert.True(result.IsSuccess);
+        Assert.Equal(ActivationStatus.Approved, request.Status);
+        await _notifier.Received(1).NotifyUserActivatedAsync(request.UserId, Arg.Any<CancellationToken>());
+    }
+
+    [Fact]
+    public async Task Handle_WhenRequestNotFound_ReturnsNotFound()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        _currentUser.UserId.Returns(Guid.NewGuid());
+
+        var handler = new ApproveActivationCommandHandler(dbContext, _identityService, _notifier, _currentUser);
+
+        var result = await handler.Handle(new ApproveActivationCommand(Guid.NewGuid()), CancellationToken.None);
+
+        Assert.False(result.IsSuccess);
+        Assert.Equal(ActivationErrors.NotFound, result.Error);
+    }
+
+    [Fact]
+    public async Task Handle_WhenAlreadyDecided_ReturnsConflict()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var request = ActivationRequest.Create(Guid.NewGuid(), null);
+        request.Approve(Guid.NewGuid());
+        dbContext.ActivationRequests.Add(request);
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        _currentUser.UserId.Returns(Guid.NewGuid());
+
+        var handler = new ApproveActivationCommandHandler(dbContext, _identityService, _notifier, _currentUser);
+
+        var result = await handler.Handle(new ApproveActivationCommand(request.Id), CancellationToken.None);
+
+        Assert.False(result.IsSuccess);
+        Assert.Equal(ActivationErrors.AlreadyDecided, result.Error);
+    }
+
+    [Fact]
+    public async Task Handle_WhenActivateUserFails_PropagatesFailureWithoutNotifying()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var adminId = Guid.NewGuid();
+        var request = ActivationRequest.Create(Guid.NewGuid(), null);
+        dbContext.ActivationRequests.Add(request);
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        _currentUser.UserId.Returns(adminId);
+        var failure = Error.NotFound("User.NotFound", "Пользователь не найден.");
+        _identityService.ActivateUserAsync(request.UserId, adminId, Arg.Any<CancellationToken>()).Returns(Result.Failure(failure));
+
+        var handler = new ApproveActivationCommandHandler(dbContext, _identityService, _notifier, _currentUser);
+
+        var result = await handler.Handle(new ApproveActivationCommand(request.Id), CancellationToken.None);
+
+        Assert.False(result.IsSuccess);
+        Assert.Equal(failure, result.Error);
+        await _notifier.DidNotReceive().NotifyUserActivatedAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>());
+    }
+}