Added `EnvelopeGenerator.WebUI.Client.Services` to the using directives. Registered `IHttpContextAccessor` to access HTTP context for request-specific information. Modified `HttpClient` setup to dynamically set the base address using the current request's host. Introduced several business services (`DocumentService`, `AuthService`, `AnnotationService`, `EnvelopeReceiverService`, `SignatureService`, `SignatureCacheService`, `AppVersionService`) to the service collection, indicating new features. Maintained existing YARP configuration. Noted the importance of DevExpress services for `DxPdfViewer`.
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