Add referee assignment/eligibility system, team bulk-add, member Groups, and referee management dashboard with PDF export

Builds the referee workflow end to end: club-defined RefereeLevel/RefereeProfile
eligibility tied to teams, EventReferee assignment (member or external, with
fee/km payment tracking), an admin dashboard with KPI tiles, date-grouped game
tiles and range filters, and a downloadable payment form PDF modeled on the
club's existing paper document (using Club.legal_name when set). Also lands
team roster bulk-add, member mass-upload with family linking, and the
members.Group model, developed alongside this work.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

teams/migrations/0008_refereelevel_refereeprofile_and_more.py

@@ -0,0 +1,54 @@
+# Generated by Django 6.0.6 on 2026-08-09 09:25
+
+import django.db.models.deletion
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('club', '0020_sponsor_logo_height_sponsor_logo_width'),
+        ('members', '0004_group_groupmembership_and_more'),
+        ('teams', '0007_teamphoto'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='RefereeLevel',
+            fields=[
+                ('created', models.DateTimeField(auto_now_add=True, verbose_name='created')),
+                ('modified', models.DateTimeField(auto_now=True, verbose_name='modified')),
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=255, verbose_name='name')),
+                ('ordering', models.PositiveSmallIntegerField(default=0, help_text='Lower numbers are listed first. Levels with the same number are ordered by name.', verbose_name='ordering')),
+                ('club', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='%(class)ss', to='club.club')),
+                ('teams', models.ManyToManyField(blank=True, help_text="Members holding this level can be assigned to referee these teams' home games.", related_name='referee_levels', to='teams.team', verbose_name='qualifies for')),
+            ],
+            options={
+                'verbose_name': 'referee level',
+                'verbose_name_plural': 'referee levels',
+                'ordering': ['ordering', 'name'],
+            },
+        ),
+        migrations.CreateModel(
+            name='RefereeProfile',
+            fields=[
+                ('created', models.DateTimeField(auto_now_add=True, verbose_name='created')),
+                ('modified', models.DateTimeField(auto_now=True, verbose_name='modified')),
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('valid_until', models.DateField(blank=True, help_text="Once this date has passed, the referee is not eligible for assignment until it's extended.", null=True, verbose_name='valid until')),
+                ('level', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='referees', to='teams.refereelevel', verbose_name='level')),
+                ('member', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='referee_profile', to='members.member', verbose_name='member')),
+            ],
+            options={
+                'verbose_name': 'referee profile',
+                'verbose_name_plural': 'referee profiles',
+                'ordering': ['member__last_name', 'member__first_name'],
+            },
+        ),
+        migrations.AddConstraint(
+            model_name='refereelevel',
+            constraint=models.UniqueConstraint(fields=('club', 'name'), name='unique_referee_level_name_per_club'),
+        ),
+    ]

teams/migrations/0009_team_referee_management.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-08-09 10:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('teams', '0008_refereelevel_refereeprofile_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='team',
+            name='referee_management',
+            field=models.CharField(choices=[('club', 'Club'), ('federation', 'Federation')], default='club', help_text="Who arranges referees for this team's home games. Federation-managed teams are left out of the referee tools entirely -- no eligibility, no assignment, nothing to configure.", max_length=20, verbose_name='referee management'),
+        ),
+    ]