Added two endpoints for Blazor-based signature flows:
- GET /elements: Returns signature placeholders for the receiver to render overlays in the Blazor UI.
- POST /blazor: Accepts Blazor-friendly signature payloads, builds annotation DTOs, and triggers the signing/notification pipeline. Signs out the user after signing.
Both endpoints are protected by the Receiver authorization policy and expose only necessary data for the client UI.
TekH
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