Add a club legal address, used for invoices/referee forms ahead of the home ground

New Club.legal_address/legal_zip_code/legal_city, editable from the
identity page (management:club_settings). Official document headers
(the dues invoice, the referee payment form) previously borrowed the
club's home Location for this -- conflating "where we play" with "our
registered address", which aren't always the same place. New
club.services.invoicing.resolve_document_address(club) picks the club's
own legal address when set, falling back to the home Location exactly as
before when it isn't, so nothing breaks for a club that hasn't set one
yet. Location.is_home now means only what it always should have: telling
a home game from an away one.

Renamed the shared "home_location" template/context variable to
"document_address" on both PDFs to match -- it was never accurate once a
legal address could win instead.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ECGMEwrc2k4D8VQuwjstj9

management/forms.py

@@ -905,7 +905,7 @@ class ClubSettingsForm(forms.ModelForm):
 
     class Meta:
         model = Club
-        fields = ["name", "legal_name", "contact_email", "website", "logo", "primary_color", "secondary_color"]
+        fields = ["name", "legal_name", "legal_address", "legal_zip_code", "legal_city", "contact_email", "website", "logo", "primary_color", "secondary_color"]
         widgets = {
             "primary_color": forms.TextInput(attrs={"placeholder": "#1e40af"}),
             "secondary_color": forms.TextInput(attrs={"placeholder": "#be185d"}),