T3-039: Anti-gaming detection

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/T3-039-anti-gaming-detection
Estimated Hours: 6h

Done When

Detect: impossible step counts (>100K/day), sleep logging while active, GPS spoofing signals. Flag suspicious activity. Withhold rewards pending review

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