Phase 1.1: Generate authentication token in RuntimeController

- Add authenticationToken field to store GUID

- Generate secure token using Guid.NewGuid().ToString('N')

- Pass token to Electron via --authtoken command-line parameter

- Token is 32 hex characters with 128 bits of entropy

src/ElectronNET.AspNet/Runtime/Controllers/RuntimeControllerAspNetDotnetFirstSignalR.cs

@@ -31,6 +31,7 @@ namespace ElectronNET.AspNet.Runtime
         private int? port;
         private string actualUrl;
         private bool electronLaunched;
+        private string authenticationToken;
 
         public RuntimeControllerAspNetDotnetFirstSignalR(
             AspNetLifetimeAdapter aspNetLifetimeAdapter, 
@@ -108,9 +109,12 @@ namespace ElectronNET.AspNet.Runtime
 
         private void LaunchElectron()
         {
+            // Generate secure authentication token
+            this.authenticationToken = Guid.NewGuid().ToString("N"); // 32 hex chars, no hyphens
+            
             var isUnPacked = ElectronNetRuntime.StartupMethod.IsUnpackaged();
             var flag = isUnPacked ? "--unpackeddotnetsignalr" : "--dotnetpackedsignalr";
-            var args = $"{flag} --electronurl={this.actualUrl}";
+            var args = $"{flag} --electronurl={this.actualUrl} --authtoken={this.authenticationToken}";
 
             this.electronProcess = new ElectronProcessActive(isUnPacked, ElectronNetRuntime.ElectronExecutable, args, this.port.Value);
             // Note: We do NOT subscribe to electronProcess.Ready in SignalR mode.

src/ElectronNET.Samples.BlazorSignalR/Program.cs

@@ -1,6 +1,5 @@
 using ElectronNET.API;
 using ElectronNET.API.Entities;
-using ElectronNET.Samples.BlazorSignalR.Components;
 
 var builder = WebApplication.CreateBuilder(args);