T3-030: Badge rarity display — % of users who have each badge

Track: 3 — Solana Phone / Web3
Section: Phase C: NFT Achievement Badges (72h)
Status: [ ] Todo
Repo: backend-api + app-user
Branch: feature/T3-030-badge-rarity-display
Estimated Hours: 3h

Done When

Each badge shows "Earned by X% of users". Calculated from total users vs badge holders

Notes

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