Rework Teams/Positions access control and add full Locations/Opponents CRUD

Team managers/coaches now only see their own teams, can't create teams,
and can view (but not edit) positions -- admins keep full rights.
Locations and Opponents move from read-only stubs to full CRUD, gated
to admins and management-position staff, with a country dropdown
(django-countries) instead of free text. Also: the team list shows
player/staff counts, and deleting a news item's main photo promotes
another one instead of leaving the item without one.

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

events/migrations/0011_location_is_home_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 6.0.6 on 2026-08-04 09:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('club', '0017_club_season_duration_months_club_season_start'),
+        ('events', '0010_attendance_showed_up'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='location',
+            name='is_home',
+            field=models.BooleanField(default=False, help_text="The club's own ground, set from the control panel -- lets an event's location tell a home game from an away one.", verbose_name='home location'),
+        ),
+        migrations.AddConstraint(
+            model_name='location',
+            constraint=models.UniqueConstraint(condition=models.Q(('is_home', True)), fields=('club',), name='unique_home_location_per_club'),
+        ),
+    ]

events/migrations/0012_alter_location_country.py

@@ -0,0 +1,19 @@
+# Generated by Django 6.0.6 on 2026-08-04 09:45
+
+import django_countries.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('events', '0011_location_is_home_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='location',
+            name='country',
+            field=django_countries.fields.CountryField(max_length=2, verbose_name='country'),
+        ),
+    ]

events/models.py

@@ -1,5 +1,7 @@
 from django.db import models
+from django.db.models import Q
 from django.utils.translation import gettext_lazy as _
+from django_countries.fields import CountryField
 
 from club.models import Season
 from members.models import Member
@@ -25,12 +27,20 @@ class Location(ClubScopedModel):
     address = models.CharField(_("address"), max_length=255)
     city = models.CharField(_("city"), max_length=255)
     zip_code = models.CharField(_("zip code"), max_length=255)
-    country = models.CharField(_("country"), max_length=255)
+    country = CountryField(_("country"))
+    is_home = models.BooleanField(
+        _("home location"),
+        default=False,
+        help_text=_("The club's own ground, set from the control panel -- lets an event's location tell a home game from an away one."),
+    )
 
     class Meta:
         verbose_name = _("location")
         verbose_name_plural = _("locations")
         ordering = ["name"]
+        constraints = [
+            models.UniqueConstraint(fields=["club"], condition=Q(is_home=True), name="unique_home_location_per_club"),
+        ]
 
     def __str__(self):
         return self.name