Complete the Season model:
- name property renders the start/end years as a "YY-YY" label (e.g.
"25-26") via strftime %y, and __str__ now returns it.
- get_current(date) returns the active club's season covering the given
date (today by default), inclusive of both boundaries, scoped through
the tenant queryset so it never crosses clubs.
Rename the tenant queryset's current() to current_club() for clarity and
update callers/tests. Cover the new behaviour; tenancy modules stay at
100%.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Bernard Siebens
3914765f90