leaderboard — real-time rankings¶

Track: 4 — Telegram Mini App
Section: Phase B: Health Challenges (40h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-014-challenge-leaderboard
Estimated Hours: 3h

Done When¶

Return ranked participants: position, name, avatar, progress, percentage of goal. Update every hour

Notes¶

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