feat(tradein-ui): Yandex admin scraper page — mirror Avito + global delay control (#488)
Replaces 5-line stub at /scrapers/yandex with full admin page mirroring Avito. 5 sections: global delay (umbrella yandex key), search around, detail snapshot, JK newbuilding, valuation. TanStack Query hooks + apiFetch, TS strict, reuses trade-in.css.
Fixup: useScraperSettings unwraps {settings:[...]} response wrapper; PUT body includes required source field (matches backend Pydantic ScraperSettingPayload). useEffect race guarded with initializedRef so 30s refetch doesn't clobber user input mid-edit.
Verdict: APPROVE — deep-code-reviewer (response shape unwrap + source field both applied).
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