Replaced scoped services from the `EnvelopeGenerator.ReceiverUI.Services` namespace with their counterparts without the namespace prefix. Added a new `SignatureCacheService` and updated `AppVersionService` to use the non-namespaced version.
Added `builder.RootComponents.Add<HeadOutlet>("head::after");` to register a root component. Introduced configuration binding for `ApiOptions` and `PdfViewerOptions`.
DevExpress components for reporting and PDF viewing remain unchanged, with additional configuration for `DevExpressBlazorReportingWebAssembly` included.