fix: disable formula recognition and add env var to toggle

feat: add pypdf as a method

fix: move sycamore to cpu

fix: concurrency limit

feat: enable formula for MinerU

fix: update default config for Docling

fix: update metadata

feat: add methods metadata

feat: add sycamore

fix: disable zerox

fix: update gemini blank key fallback

feat: add img2table gmft

fix: minor update backend

fix: add requirements.txt, fix empty debug dir

feat: add enable visualization flag

feat: add image support

feat: initial commit