Add a market-focused seeding path so the catalogue can be built from
domestic products rather than the English-heavy global default:
- adapter.fetch_by_country(country): OFF search filtered by
countries_tags_en, sorted by unique_scans_n (most-scanned first),
de-duplicated across pages since OFF popularity ordering is unstable.
- is_cn_gs1(code): True for GS1-China company prefixes (690-699),
i.e. genuinely domestic items vs. imports merely sold in China.
- seed_off --country <slug> [--domestic-only] [--page-size/--max-pages]:
e.g. 'seed_off --country china --domestic-only' loads only 69x
barcodes.
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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