Add a home-location box to the club detail page in the control panel

Setting a club's home ground here creates/updates the same events.Location
row (flagged is_home) that the club's own Teams > Locations page shows and
edits -- no separate sync step, it's the same record either way. Also
fixes the shared form_field templatetag: django-countries' CountryField
widget reports as "lazyselect", which fell through to a broken plain
text input instead of rendering as a dropdown.

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

controlpanel/urls.py

@@ -13,6 +13,7 @@ urlpatterns = [
     path("clubs/<uuid:pk>/edit/", views.ClubUpdateView.as_view(), name="club_update"),
     path("clubs/<uuid:pk>/archive/", views.ClubArchiveView.as_view(), name="club_archive"),
     path("clubs/<uuid:pk>/restore/", views.ClubRestoreView.as_view(), name="club_restore"),
+    path("clubs/<uuid:pk>/home-location/", views.ClubHomeLocationSetView.as_view(), name="club_home_location_set"),
     path("clubs/<uuid:pk>/admins/add/", views.ClubAdminAddView.as_view(), name="club_admin_add"),
     path("clubs/<uuid:pk>/admins/<uuid:role_pk>/remove/", views.ClubAdminRemoveView.as_view(), name="club_admin_remove"),
     path("clubs/<uuid:pk>/features/<int:flag_pk>/toggle/", views.ClubFeatureToggleView.as_view(), name="club_feature_toggle"),