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/TestSupport/FakeCurrentUser.cs

@@ -0,0 +1,17 @@
+using PnvPanel.Application.Common.Interfaces;
+
+namespace PnvPanel.Application.Tests.TestSupport;
+
+public sealed class FakeCurrentUser : ICurrentUser
+{
+    public Guid? UserId { get; set; }
+
+    public string? UserName { get; set; }
+
+    public bool IsAuthenticated => UserId is not null;
+
+    public static FakeCurrentUser Authenticated(Guid userId, string userName = "testuser")
+        => new() { UserId = userId, UserName = userName };
+
+    public static FakeCurrentUser Anonymous() => new();
+}

backend/tests/PnvPanel.Application.Tests/TestSupport/InMemoryDbContextFactory.cs

@@ -0,0 +1,21 @@
+using Microsoft.EntityFrameworkCore;
+using PnvPanel.Infrastructure.Persistence;
+
+namespace PnvPanel.Application.Tests.TestSupport;
+
+/// <summary>
+/// EF Core InMemory provider, не Sqlite/Npgsql — модель использует Postgres-специфичные типы
+/// (uuid[] на Inbound.AllowedRoleIds, jsonb на AuditLog.Metadata), не имеющие реляционных
+/// аналогов. InMemory игнорирует HasColumnType и не требует их маппинга.
+/// </summary>
+public static class InMemoryDbContextFactory
+{
+    public static AppDbContext Create()
+    {
+        var options = new DbContextOptionsBuilder<AppDbContext>()
+            .UseInMemoryDatabase(Guid.NewGuid().ToString())
+            .Options;
+
+        return new AppDbContext(options);
+    }
+}