Add EnvelopeReceiverService to DI container

A new service, `EnvelopeGenerator.ReceiverUI.Services.EnvelopeReceiverService`, was registered in the dependency injection container using `AddScoped`. This ensures the service is available for injection with a scoped lifetime, creating a new instance per HTTP request or scope.

EnvelopeGenerator.ReceiverUI/Program.cs

@@ -17,6 +17,7 @@ builder.Configuration.GetSection(ApiOptions.SectionName).Bind(opts));
 builder.Services.AddScoped<EnvelopeGenerator.ReceiverUI.Services.DocumentService>();
 builder.Services.AddScoped<EnvelopeGenerator.ReceiverUI.Services.AuthService>();
 builder.Services.AddScoped<EnvelopeGenerator.ReceiverUI.Services.AnnotationService>();
+builder.Services.AddScoped<EnvelopeGenerator.ReceiverUI.Services.EnvelopeReceiverService>();
 
 builder.Services.AddDevExpressWebAssemblyBlazorReportViewer();
 builder.Services.AddDevExpressWebAssemblyBlazorPdfViewer();