Enhance AppConfig with JWT settings and update Program.cs for improved authentication handling. Modify README.md to reflect new environment variable structure for configuration.

backend-dotnet/InsecureDevAuthenticationHandler.cs

@@ -0,0 +1,36 @@
+using DexDemoBackend;
+using Microsoft.AspNetCore.Authentication;
+using System.Security.Claims;
+using Microsoft.Extensions.Options;
+using System.Text.Encodings.Web;
+
+public class InsecureDevAuthenticationHandler : AuthenticationHandler<AuthenticationSchemeOptions>
+{
+    private readonly AppConfig _config;
+
+    public InsecureDevAuthenticationHandler(
+        IOptionsMonitor<AuthenticationSchemeOptions> options,
+        ILoggerFactory logger,
+        UrlEncoder encoder,
+        AppConfig config) : base(options, logger, encoder)
+    {
+        _config = config;
+    }
+
+    protected override Task<AuthenticateResult> HandleAuthenticateAsync()
+    {
+        var email = _config.InsecureDevEmail ?? "dev@example.com";
+
+        var claims = new[]
+        {
+            new Claim(ClaimTypes.Name, email),
+            new Claim(_config.EmailClaimType, email)
+        };
+
+        var identity = new ClaimsIdentity(claims, Scheme.Name);
+        var principal = new ClaimsPrincipal(identity);
+        var ticket = new AuthenticationTicket(principal, Scheme.Name);
+
+        return Task.FromResult(AuthenticateResult.Success(ticket));
+    }
+}