Added YARP reverse proxy for API routing and DevExpress Blazor components for advanced UI features, including PDF Viewer. Updated `EnvelopeGenerator.WebUI.csproj` to include necessary packages and ensure `yarp.json` is copied to the output directory. Modified `Program.cs` to configure YARP and DevExpress services, and adjusted the HTTP pipeline for proper routing. Updated `appsettings.json` with `ApiOptions` and `PdfViewerOptions`. Added `yarp.json` to define reverse proxy routes and clusters.
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