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.Infrastructure/Identity/CurrentUser.cs

@@ -4,20 +4,27 @@ using PnvPanel.Application.Common.Interfaces;
 
 namespace PnvPanel.Infrastructure.Identity;
 
-internal sealed class CurrentUser(IHttpContextAccessor httpContextAccessor) : ICurrentUser
+/// <summary>
+/// В HTTP-запросах читает JWT-claims. В Telegram-боте (нет HttpContext) вызывающая сторона
+/// заранее задаёт пользователя через ICurrentUserSetter.SetUser(...) в рамках DI-scope апдейта.
+/// </summary>
+internal sealed class CurrentUser(IHttpContextAccessor httpContextAccessor) : ICurrentUser, ICurrentUserSetter
 {
+    private (Guid Id, string Name)? _override;
+
     private ClaimsPrincipal? Principal => httpContextAccessor.HttpContext?.User;
 
-    public Guid? UserId
+    public Guid? UserId => _override?.Id ?? ParseHttpUserId();
+
+    public string? UserName => _override?.Name ?? Principal?.FindFirstValue(ClaimTypes.Name);
+
+    public bool IsAuthenticated => _override is not null || (Principal?.Identity?.IsAuthenticated ?? false);
+
+    public void SetUser(Guid userId, string userName) => _override = (userId, userName);
+
+    private Guid? ParseHttpUserId()
     {
-        get
-        {
-            var value = Principal?.FindFirstValue(ClaimTypes.NameIdentifier);
-            return Guid.TryParse(value, out var id) ? id : null;
-        }
+        var value = Principal?.FindFirstValue(ClaimTypes.NameIdentifier);
+        return Guid.TryParse(value, out var id) ? id : null;
     }
-
-    public string? UserName => Principal?.FindFirstValue(ClaimTypes.Name);
-
-    public bool IsAuthenticated => Principal?.Identity?.IsAuthenticated ?? false;
 }