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/AppConfig.cs

@@ -12,7 +12,16 @@ public class AppConfig
     public string? InsecureDevEmail { get; set; }
     public string[] AllowedOrigins { get; set; } = ["http://localhost:3000", "https://localhost:3000"];
 
+    // JWT configuration
+    public string NameClaimType { get; set; } = "name";
+    public string RoleClaimType { get; set; } = "role";
+    public string EmailClaimType { get; set; } = "email";
+    public string AuthRequestEmailHeader { get; set; } = "X-Auth-Request-Email";
+    public TimeSpan ClockSkew { get; set; } = TimeSpan.FromMinutes(5);
+
     public string ConnectionString =>
         $"Host={DbHost};Port={DbPort};Database={DbName};Username={DbUser};Password={DbPassword}";
 }
 
+
+