T3-029: Leaderboard by badges earned

Track: 3 — Solana Phone / Web3
Section: Phase C: NFT Achievement Badges (72h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-029-badge-leaderboard
Estimated Hours: 4h

Done When

GET /leaderboard/badges — ranked by total badges earned. Shows top 50. User's rank included

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