Integrate YARP to forward all /api/** requests from the browser to the backend EnvelopeGenerator.API service. Add Yarp.ReverseProxy package, configure proxy routes and clusters in appsettings.json, and register YARP in Program.cs. Add API base URL configuration and register ReceiverApiClient, LocalizationService, and ReceiverAuthState as scoped services to support both server and client scenarios. This improves API/UI separation and authentication handling.
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