Brings the bypos JSONL import backend (handler + store) into main so the
bypos-collector tool's import feature works end-to-end. Records are upserted
on GTIN with manufacturer/MSRP/barcode/source provenance, quality recomputed
per product. Only status=hit records with a name are imported.
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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