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

static/css/app.css

@@ -5584,6 +5584,11 @@
       line-height: var(--tw-leading, var(--text-xl--line-height));
     }
   }
+  .md\:col-span-2 {
+    @media (width >= 48rem) {
+      grid-column: span 2 / span 2;
+    }
+  }
   .md\:grid-cols-2 {
     @media (width >= 48rem) {
       grid-template-columns: repeat(2, minmax(0, 1fr));