- Add generate_from_unified_document() method for direct UnifiedDocument processing
- Create convert_unified_document_to_ocr_data() for format conversion
- Extract _generate_pdf_from_data() as reusable core logic
- Support both OCR and DIRECT processing tracks in PDF generation
- Handle coordinate transformations (BoundingBox to polygon format)
- Update OCR service to use appropriate PDF generation method
Completes Section 4 (Unified Processing Pipeline) of dual-track proposal.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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