Add UPC prefix filter for mobile barcode scanning#563
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Mobile camera frameworks (Google ML Kit, AVFoundation) strip the 5-digit EAN supplemental from scanned UPC barcodes. Add upc_starts_with to IssueFilter so clients can get an issue list using just the 12-digit UPC-A.
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Summary
upc_starts_withfilter toIssueFilterfor the/api/issue/endpoint, matching issues whoseupcfield starts with the given valueupcmatches fail for scanned codes — this lets clients search with just the 12 digits they haveapi/README.mdCloses #562