Add billing-ending banner, events CRUD, RBIHF import, public API, team photos, and sponsors

A large batch of club-management features built up over one session:

- Club dashboard banner warning admins 1 month before billing ends
- Full Events/EventSeries CRUD (recurrence builder, occurrence lifecycle,
  per-team permissions), with match->game rename and game-specific fields
  (score, competition, live status, external game ID)
- Django-admin competition dropdown, gated per-club by feature flag
- Auto-import of RBIHF fixtures (scrape -> diff -> preview -> confirm),
  with location/opponent dropdowns suggested from existing club data
- Feature-flag-gated Shop/Forms nav sections, reusing the same flag
  machinery for the RBIHF import button
- Team roster now scoped to members active this season or next, sorted and
  grouped by position
- Club sport type (ice hockey / other), shown in the control panel's club
  subtitle
- Per-season team photo upload from the team page
- New public read-only API (Django Ninja) at /api/v1/: news, team rosters,
  upcoming/live/per-team games, and sponsors -- auto-documented via Swagger
  UI, CORS-enabled for a club's own external website
- Club sponsors: admin-only CRUD (logo, URL, active date window) plus a
  date-windowed, optionally randomized API endpoint
- Assorted fixes: NullBooleanField dropdown rendering, cross-club event
  validation timing, searchable-select chip placement, btn-neutral ->
  default button style sweep, calendar-month chart windows

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R1gj3J1QPfP38XWpnpbFpy

management/urls.py

@@ -47,6 +47,8 @@ urlpatterns = [
     path("teams/<uuid:pk>/staff/<uuid:season_pk>/add/", views.TeamStaffAddView.as_view(), name="team_staff_add"),
     path("teams/<uuid:pk>/staff/<uuid:assignment_pk>/edit/", views.TeamStaffUpdateView.as_view(), name="team_staff_update"),
     path("teams/<uuid:pk>/staff/<uuid:assignment_pk>/remove/", views.TeamStaffRemoveView.as_view(), name="team_staff_remove"),
+    path("teams/<uuid:pk>/photo/<uuid:season_pk>/set/", views.TeamPhotoSetView.as_view(), name="team_photo_set"),
+    path("teams/<uuid:pk>/photo/<uuid:season_pk>/delete/", views.TeamPhotoDeleteView.as_view(), name="team_photo_delete"),
     # News
     path("news/", views.NewsListView.as_view(), name="news_list"),
     path("news/new/", views.NewsCreateView.as_view(), name="news_create"),
@@ -60,7 +62,20 @@ urlpatterns = [
     path("news/<uuid:pk>/photos/<uuid:photo_pk>/delete/", views.NewsPhotoDeleteView.as_view(), name="news_photo_delete"),
     # Calendar
     path("events/", views.EventListView.as_view(), name="event_list"),
-    path("event-series/", views.EventSeriesListView.as_view(), name="event_series_list"),
+    path("events/new/", views.EventCreateView.as_view(), name="event_create"),
+    path("events/<uuid:pk>/", views.EventDetailView.as_view(), name="event_detail"),
+    path("events/<uuid:pk>/edit/", views.EventUpdateView.as_view(), name="event_update"),
+    path("events/<uuid:pk>/delete/", views.EventDeleteView.as_view(), name="event_delete"),
+    path("events/<uuid:pk>/detach/", views.EventDetachView.as_view(), name="event_detach"),
+    path("events/<uuid:pk>/fetch-game-info/", views.EventFetchGameInfoView.as_view(), name="event_fetch_game_info"),
+    path("events/rbihf-import/", views.RBIHFImportView.as_view(), name="rbihf_import"),
+    path("events/rbihf-import/confirm/", views.RBIHFImportConfirmView.as_view(), name="rbihf_import_confirm"),
+    path("event-series/new/", views.EventSeriesCreateView.as_view(), name="event_series_create"),
+    path("event-series/<uuid:pk>/", views.EventSeriesDetailView.as_view(), name="event_series_detail"),
+    path("event-series/<uuid:pk>/edit/", views.EventSeriesUpdateView.as_view(), name="event_series_update"),
+    path("event-series/<uuid:pk>/delete/", views.EventSeriesDeleteView.as_view(), name="event_series_delete"),
+    path("event-series/<uuid:pk>/stop/", views.EventSeriesStopView.as_view(), name="event_series_stop"),
+    path("event-series/<uuid:pk>/generate/", views.EventSeriesGenerateView.as_view(), name="event_series_generate"),
     path("locations/", views.LocationListView.as_view(), name="location_list"),
     path("locations/new/", views.LocationCreateView.as_view(), name="location_create"),
     path("locations/<uuid:pk>/edit/", views.LocationUpdateView.as_view(), name="location_update"),
@@ -69,6 +84,11 @@ urlpatterns = [
     path("opponents/new/", views.OpponentCreateView.as_view(), name="opponent_create"),
     path("opponents/<uuid:pk>/edit/", views.OpponentUpdateView.as_view(), name="opponent_update"),
     path("opponents/<uuid:pk>/delete/", views.OpponentDeleteView.as_view(), name="opponent_delete"),
+    # Sponsors (admin only)
+    path("sponsors/", views.SponsorListView.as_view(), name="sponsor_list"),
+    path("sponsors/new/", views.SponsorCreateView.as_view(), name="sponsor_create"),
+    path("sponsors/<uuid:pk>/edit/", views.SponsorUpdateView.as_view(), name="sponsor_update"),
+    path("sponsors/<uuid:pk>/delete/", views.SponsorDeleteView.as_view(), name="sponsor_delete"),
     # Shop (admin only)
     path("shop/products/", views.ProductListView.as_view(), name="product_list"),
     path("shop/orders/", views.OrderListView.as_view(), name="order_list"),