T3-041: Leaderboard — top earners

Track: 3 — Solana Phone / Web3
Section: Phase D: Health-to-Earn (40h, conditional on Phase A-C traction)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-041-earner-leaderboard
Estimated Hours: 3h

Done When

GET /leaderboard/earn — weekly/monthly top earners. Prizes for top 10 (extra points, exclusive badges)

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