fix(web): set default authentication scheme

src/dotnet/QuantEngine.Web/Program.cs

@@ -16,6 +16,9 @@ using QuantEngine.Web.Endpoints;
 using System.Security.Cryptography;
 using System.Text;
 using QuantEngine.Core.Models;
+using Microsoft.AspNetCore.Authentication;
+using System.Text.Encodings.Web;
+using Microsoft.Extensions.Options;
 
 // Serilog Configuration with Telegram Sink
 Log.Logger = new LoggerConfiguration()
@@ -33,7 +36,8 @@ builder.Services.AddRazorComponents()
 
 // Authentication and Custom State Provider (Shared client components)
 builder.Services.AddCascadingAuthenticationState();
-builder.Services.AddAuthentication();
+builder.Services.AddAuthentication("QuantAdminScheme")
+    .AddScheme<AuthenticationSchemeOptions, QuantAdminAuthHandler>("QuantAdminScheme", _ => { });
 builder.Services.AddAuthorization();
 builder.Services.AddScoped<LocalStorageService>();
 builder.Services.AddScoped<AuthenticationStateProvider, CustomAuthenticationStateProvider>();
@@ -267,3 +271,25 @@ public class LoginRequest
     public string Password { get; set; } = "";
 }
 
+internal sealed class QuantAdminAuthHandler : AuthenticationHandler<AuthenticationSchemeOptions>
+{
+    public QuantAdminAuthHandler(
+        IOptionsMonitor<AuthenticationSchemeOptions> options,
+        ILoggerFactory logger,
+        UrlEncoder encoder)
+        : base(options, logger, encoder)
+    {
+    }
+
+    protected override Task<AuthenticateResult> HandleAuthenticateAsync()
+    {
+        return Task.FromResult(AuthenticateResult.NoResult());
+    }
+
+    protected override Task HandleChallengeAsync(AuthenticationProperties properties)
+    {
+        Response.StatusCode = StatusCodes.Status401Unauthorized;
+        return Task.CompletedTask;
+    }
+}
+