Backend:
- Add get_teams_by_owner() to SBA API client
- Update /api/auth/me to return user's teams from SBA API
- Add sba_current_season config setting (default: 13)
Frontend:
- Replace hardcoded myTeamId with computed from auth store teams
- Fix isMyTurn logic to check actual team ownership
- Update REFACTORING_PLAN.json
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>