Add HttpContextAccessor to service registration

HttpContextAccessor is now included in the service container to enable dependency injection for accessing HTTP context. This improves support for features that require context details during runtime.

src/modules/Elsa.Identity/Features/IdentityFeature.cs

@@ -199,6 +199,7 @@ public class IdentityFeature : FeatureBase
             .AddScoped<ISecretGenerator, DefaultSecretGenerator>()
             .AddScoped<IRandomStringGenerator, DefaultRandomStringGenerator>()
             .AddScoped<DefaultApiKeyGeneratorAndParser>()
+            .AddHttpContextAccessor()
             ;
     }
 }