- Fix Member.create(): post_save signal creates Member immediately on User creation,
so new users always hit the hasattr branch; check `created` flag to set initial
password and notes for genuinely new users
- Fix Season.for_date(): replace get() with filter().order_by("-start_date").first()
to handle overlapping seasons gracefully and raise DoesNotExist when none match
- Add TeamRole, Team, TeamMembership, TeamPicture models with rules permissions
- Add migration 0002 for new models
- Add test suites for members and teams covering all new model behaviour
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
