feat: integrate d3-org-chart for network visualization and add SignalR token notification service

src/FrontOffice.Main/ConfigureServices.cs

@@ -62,6 +62,9 @@ public static class ConfigureServices
         services.AddTransient<IDeviceDetector, DeviceDetector>();
         // PDF generation (Chromium only)
         services.AddSingleton<FrontOffice.Main.Utilities.Pdf.IChromiumPdfService, FrontOffice.Main.Utilities.Pdf.ChromiumPdfService>();
+        
+        // SignalR Token Notification Service
+        services.AddScoped<TokenNotificationService>();
 
         return services;
     }