T3-033: SDK badge service

Track: 3 — Solana Phone / Web3
Section: Phase C: NFT Achievement Badges (72h)
Status: [ ] Todo
Repo: athion-sdk
Branch: feature/T3-033-sdk-badge-service
Estimated Hours: 4h

Done When

AchievementService with methods: listBadges(), getBadge(id), mintBadge(badgeType), getLeaderboard(). Typed models

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