SDK-006: Buddy models — all request/response types

Track: 1 — MVP
Section: 1.17 Buddy Service (0/23 endpoints)
Status: [ ] Todo
Repo: athion-sdk
Branch: feature/SDK-006-buddy-models

Done When

BuddyChallenge, BuddyMatch, BuddyMessage, BuddySession, BuddyStats models in lib/src/models/buddy.dart. All have fromJson/toJson

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