- Add MinerU converter engine (src/converters/mineru.ts)
- Support md-t (table as Markdown) and md-i (table as image) output formats
- Input formats: pdf, ppt, pptx, xls, xlsx, doc, docx
- Output as ZIP archive containing Markdown and images
- Update Dockerfile to install magic-pdf via pipx
- Add zip utility for archive creation
- Update normalizeFiletype to map md-t/md-i to zip extension
- Add comprehensive tests for MinerU converter
- Update README with MinerU documentation
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