T4-013: Challenge progress tracking — update daily from health data

Track: 4 — Telegram Mini App
Section: Phase B: Health Challenges (40h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-013-challenge-progress-tracking
Estimated Hours: 4h

Done When

Background job: for each active challenge, calculate each participant's progress from health_metrics. Steps challenge = sum steps. Sleep challenge = avg sleep score

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