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

club/migrations/0030_club_legal_address_club_legal_city_and_more.py

@@ -0,0 +1,28 @@
+# Generated by Django 6.0.6 on 2026-08-21 15:45
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('club', '0029_duesinvoice'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='club',
+            name='legal_address',
+            field=models.CharField(blank=True, help_text="Street address for official documents (invoices, the referee payment form). Falls back to the home location's address when left blank -- set this when the club's registered address isn't where it actually plays.", max_length=255, verbose_name='legal address'),
+        ),
+        migrations.AddField(
+            model_name='club',
+            name='legal_city',
+            field=models.CharField(blank=True, max_length=255, verbose_name='legal city'),
+        ),
+        migrations.AddField(
+            model_name='club',
+            name='legal_zip_code',
+            field=models.CharField(blank=True, max_length=255, verbose_name='legal zip code'),
+        ),
+    ]