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Phase 1 of the clean architecture refactor: Replaces the 751-line ocr-overlay monolith with a modular pipeline. Each step gets its own component file. Frontend: /ai/ocr-kombi route with 11 steps (Upload, Orientation, PageSplit, Deskew, Dewarp, ContentCrop, OCR, Structure, GridBuild, GridReview, GroundTruth). Session list supports document grouping for multi-page uploads. Backend: New ocr_kombi/ module with multi-page PDF upload (splits PDF into N sessions with shared document_group_id). DB migration adds document_group_id and page_number columns. Old /ai/ocr-overlay remains fully functional for A/B testing. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>