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/pdf_previews.py

@@ -58,9 +58,9 @@ def _referee_form_pdf_context(club, request):
         opponent="Leuven",
         external_game_id="BE-2026-00417",
     )
-    home_location = SimpleNamespace(address="Sportlaan 1", zip_code="1000", city="Brussels")
+    document_address = SimpleNamespace(address="Sportlaan 1", zip_code="1000", city="Brussels")
     grand_total = sum((referee.total_payable for referee in referees), Decimal("0"))
-    return {"club": club, "event": event, "referees": referees, "home_location": home_location, "grand_total": grand_total} | referee_form_colors(club)
+    return {"club": club, "event": event, "referees": referees, "document_address": document_address, "grand_total": grand_total} | referee_form_colors(club)
 
 
 PDF_PREVIEWS = [