- Add DOCX MIME type to ALLOWED_DOCUMENT_TYPES in storage_service.py
- Add python-docx text extraction in _generate_ai_description
- Extract shared _store_document_content helper for PDF/DOCX
- Add python-docx>=1.1.0 to requirements.txt
- Add tests for docx upload acceptance and document fetch
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>