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Support multi-format uploads (PDF/images/Excel/Word/PPT/ODF/text) with AI text extraction
- Backend: extend ALLOWED_DATASET_EXTENSIONS + BINARY_EXTRACTION_EXTS - Add backend/document_parser.py: extract text from PDF (pypdf), images (pytesseract OCR), XLSX (openpyxl), DOCX (python-docx), PPTX (python-pptx), legacy/ODF via LibreOffice - Inject extracted text as SYSTEM context so text-only LLM backends can understand files - Frontend: widen file accept + extension checks + error message - Dockerfile: install tesseract-ocr(+eng, vie), libreoffice, and python doc deps21c88c7