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/Auth/Me/GetCurrentUserQueryHandler.cs

@@ -16,6 +16,8 @@ public sealed class GetCurrentUserQueryHandler(IIdentityService identityService,
         if (profile is null)
             return Result.Failure<CurrentUserDto>(AuthErrors.Unauthorized);
 
-        return Result.Success(new CurrentUserDto(profile.Id, profile.UserName, profile.Role, profile.IsActivated));
+        var telegramInfo = await identityService.GetTelegramLinkInfoAsync(userId, cancellationToken);
+
+        return Result.Success(new CurrentUserDto(profile.Id, profile.UserName, profile.Role, profile.IsActivated, telegramInfo.IsLinked));
     }
 }