TekH 93142a56f7 Add signature ink handling and DevExpress integration ...

Introduced `ISignatureInkPayload` interface to standardize signature ink data and metadata. Updated `DocReceiverElementDto` and `DocReceiverElement` to implement this interface. Enhanced `IPdfPageImageRenderer` with methods for signature preview generation and image format validation.

Replaced `PdfSharp` with `DevExpress` for PDF rendering in `ReceiverSignedPage.razor`. Added `DevSignatureInkController` with endpoints for downloading raw and composed signature images. Updated project files to remove `SixLabors.ImageSharp` and integrate DevExpress.

Added configuration for development endpoints in `appsettings.json`. Improved exception handling, validation, and code maintainability.

2026-10-19 14:27:21 +02:00

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