AI enrichment workflow

Queue: catalog status: incomplete or enrichment_status of incomplete or draft_ready. On imported rows only: paste 1–5 official source URLs, save them, then Generate draft (backend fetches URLs and runs optional OpenAI extraction). No auto-publish — Approve writes source-backed (and admin-edited) fields into the row; numeric specs are only taken when values parse cleanly. Configure API origin with window.carPlatformEnrichmentApiBase (Flask) or window.carPlatformSourceFinderApiBase (Vercel) if the page is not same-origin. Find Sources uses POST /api/find-car-sources (Vercel: frontend/api/find-car-sources.js with TAVILY_API_KEY / SERPER_API_KEY; Flask: same path with SOURCE_FINDER_ENABLED=0 for placeholder).