feat(backend): add admin evaluation history, engine, simulation, bot API controllers and global exception middleware

FinlyticBackend/Hubs/SystemHealthHub.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.SignalR;
 using Microsoft.Extensions.Logging;
 
@@ -8,6 +9,7 @@ namespace FinlyticBackend.Hubs;
 /// <summary>
 /// SignalR Hub broadcasting real-time system diagnostics & microservice health updates to connected clients.
 /// </summary>
+[Authorize]
 public class SystemHealthHub : Hub
 {
     private readonly ILogger<SystemHealthHub> _logger;