- Add multi-model adapter (OpenAI-compatible) with AI config service
- Add PaddleOCR + VietOCR 2-tier OCR pipeline for Vietnamese documents
- Add external ID sync script for library integration
- Add Supabase migration for external_id column
- Add nginx config for ebook platform
- Add utility scripts: reset admin password, run migrations, test API
- Update docs: deployment guide, server migration, model switching, features
- Add LIBOL iframe integration guide and library integration plan
- Update web: admin upload page, book detail page, auth lib

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>