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/AuthErrors.cs

@@ -18,4 +18,7 @@ public static class AuthErrors
 
     public static readonly Error Unauthorized =
         Error.Unauthorized("Auth.Unauthorized", "Требуется аутентификация.");
+
+    public static readonly Error UserBlocked =
+        Error.Forbidden("Auth.UserBlocked", "Аккаунт заблокирован администратором.");
 }

backend/src/PnvPanel.Application/Auth/CurrentUserDto.cs

@@ -1,3 +1,3 @@
 namespace PnvPanel.Application.Auth;
 
-public sealed record CurrentUserDto(Guid Id, string UserName, string Role, bool IsActivated);
+public sealed record CurrentUserDto(Guid Id, string UserName, string Role, bool IsActivated, bool TelegramLinked);

backend/src/PnvPanel.Application/Auth/Login/LoginCommandHandler.cs

@@ -23,7 +23,8 @@ public sealed class LoginCommandHandler(
         var (accessToken, accessExpiresAt) = jwtTokenService.GenerateAccessToken(user);
         var refreshToken = await refreshTokenService.IssueAsync(user.Id, cancellationToken);
 
-        var dto = new CurrentUserDto(profile.Id, profile.UserName, profile.Role, profile.IsActivated);
+        var telegramInfo = await identityService.GetTelegramLinkInfoAsync(profile.Id, cancellationToken);
+        var dto = new CurrentUserDto(profile.Id, profile.UserName, profile.Role, profile.IsActivated, telegramInfo.IsLinked);
 
         return Result.Success(new AuthResult(
             accessToken,

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));
     }
 }

backend/src/PnvPanel.Application/Auth/Refresh/RefreshCommandHandler.cs

@@ -22,7 +22,8 @@ public sealed class RefreshCommandHandler(
         var authUser = new AuthenticatedUser(profile.Id, profile.UserName, profile.Role);
         var (accessToken, accessExpiresAt) = jwtTokenService.GenerateAccessToken(authUser);
 
-        var dto = new CurrentUserDto(profile.Id, profile.UserName, profile.Role, profile.IsActivated);
+        var telegramInfo = await identityService.GetTelegramLinkInfoAsync(profile.Id, cancellationToken);
+        var dto = new CurrentUserDto(profile.Id, profile.UserName, profile.Role, profile.IsActivated, telegramInfo.IsLinked);
 
         return Result.Success(new AuthResult(
             accessToken,