TekH 41f97ce533 feat(infrastructure): Implement DevExpressPdfProcessor.AddAnnotationAsync ...

- Implement AddAnnotationAsync using DevExpress PdfDocumentProcessor
- Add 5 private helper methods (one per annotation type)
- Add ParseColor helper (hex string to PdfRGBColor)
- Validation: content required for FreeText/StickyNote, style for TextMarkup
- Default colors: Yellow for TextMarkup, Red for others
- Handle DevExpress API quirks (TextMarkupStyle.StrikeOut capitalization)

2026-07-21 12:28:05 +02:00

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