feat: move Sanity/GROQ sync out of FastAPI process into Redis + Celery#1

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copilot/implement-scalability-improvements

Commits on May 2, 2026

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Copilot
authored
feat: replace APScheduler with Redis + Celery for scalable background sync

Copilot
and
Medalcode
authored
fix: add vercel.json pointing to frontend/ subdirectory and update README

Copilot
and
Medalcode
authored