Drop removed PaddleOCR 3.x args (show_log/use_angle_cls); fall back to .predict()

Replace ad-hoc shim with meta-path finder for any langchain.* import

Shim langchain.docstore.document instead of installing langchain (avoid dep conflicts)

Add langchain deps required by paddlex retriever module

Fix libgl1 package name for Debian Trixie

Add PaddleOCR FastAPI service

initial commit