Implements missing layout analysis capabilities:
- Add footer detection based on page position (bottom 10%)
- Build hierarchical section structure from font sizes
- Create nested list structure from indentation levels
All elements now have proper metadata for:
- section_level, parent_section, child_sections (headers)
- list_level, parent_item, children (list items)
- is_page_header, is_page_footer flags
Updates tasks.md to reflect accurate completion status.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added foundation for dual-track document processing:
1. UnifiedDocument Model (backend/app/models/unified_document.py)
- Common output format for both OCR and direct extraction
- Comprehensive element types (23+ types from PP-StructureV3)
- BoundingBox, StyleInfo, TableData structures
- Backward compatibility with legacy format
2. DocumentTypeDetector Service (backend/app/services/document_type_detector.py)
- Intelligent document type detection using python-magic
- PDF editability analysis using PyMuPDF
- Processing track recommendation with confidence scores
- Support for PDF, images, Office docs, and text files
3. DirectExtractionEngine Service (backend/app/services/direct_extraction_engine.py)
- Fast extraction from editable PDFs using PyMuPDF
- Preserves fonts, colors, and exact positioning
- Native and positional table detection
- Image extraction with coordinates
- Hyperlink and metadata extraction
4. Dependencies
- Added PyMuPDF>=1.23.0 for PDF extraction
- Added pdfplumber>=0.10.0 as fallback
- Added python-magic-bin>=0.4.14 for file detection
Next: Integrate with OCR service for complete dual-track processing
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
