Add row-based multi-tenancy plumbing keyed on Club as the tenant root:
- ClubTenantMiddleware maps the request's subdomain to a Club by slug,
storing it on request.club and in a contextvar so service-layer code
and management commands can read it via get_current_club(). Resolution
honours CLUBMANAGER_BASE_DOMAIN (e.g. ajax-united.clubmanager.app),
falling back to generic slug.example.com hosts, and ignores the bare
base domain, www, and unknown slugs.
- Club gains a unique slug (auto-derived from name on save) plus a
ClubManager.current() accessor for the active tenant.
- ClubScopedModel gets a TenantQuerySet (.for_club()/.current()) and
auto-fills club from the active context on save.
Contextvar helpers live in club.tenancy; Club is imported lazily there
and in clubmanager.base to avoid an import cycle with club.models.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Bernard Siebens
72e7b5e070