T3-022: Badge trigger system — detect achievements

Track: 3 — Solana Phone / Web3
Section: Phase C: NFT Achievement Badges (72h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-022-badge-trigger-system
Estimated Hours: 8h

Done When

Background job checks user milestones: 7-day streak? First 10K steps day? Triggers NFT mint when milestone reached. Idempotent — won't mint same badge twice

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