T3-031: Seasonal/limited badges — time-limited achievement NFTs

Track: 3 — Solana Phone / Web3
Section: Phase C: NFT Achievement Badges (72h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-031-seasonal-limited-badges
Estimated Hours: 4h

Done When

Admin can create time-limited badges (e.g., "March Madness" — 100K steps in March). Auto-expires. Creates FOMO

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