Removed unused using statements

src/Server/SearchdomainManager.cs

@@ -1,9 +1,7 @@
 using MySql.Data.MySqlClient;
 using System.Data.Common;
-using OllamaSharp;
-using Microsoft.IdentityModel.Tokens;
-using Server.Exceptions;
 using Server.Migrations;
+using Server.Helper;
 
 namespace Server;