Add pennyocr input backend (hosted OCR API, stdlib-only) - #751
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A stdlib-only input module for the PennyOCR API: uploads the document, returns plain text with form-feed page separators (matching pdftotext's convention). No local OCR engine, GPU or system binary needed; availability is gated on the PENNYOCR_API_KEY env var so it self-excludes when unset. Includes unit tests with the network mocked.
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Adds a new input backend for PennyOCR, a hosted VLM-based OCR API.
Why it fits invoice2data: users without a local OCR stack (no tesseract binary, no GPU for docTR/paddle, no GCS bucket for gvision) get scanned-invoice support with nothing but an env var. Handles scanned PDFs, photos and images; multipage output uses form-feed separators like the pdftotext backend, so existing templates behave identically.
Implementation notes
input/__interface__.py:to_text(path, area_details=None, **kwargs),SUPPORTS_AREA = False,is_available()gated onPENNYOCR_API_KEYso the backend self-excludes when unconfiguredINPUT_MODULESaspennyocr; README list updatedtests/test_pennyocr.py, network mocked): registration, availability gating, multipart request shape, error path — all passingService details, for transparency: commercial API, $0.75 per 1,000 pages with 100 free pages/month (no card), zero data retention by default. Disclosure: I'm the maintainer of PennyOCR. Happy to adjust anything — naming, error semantics, or moving it behind an extra if you prefer.
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