Extend admin, migrations, and tests for authentication and club apps

- Implement admin configurations for User, Member, Family, and FamilyMembership, with specialized inlines and filtered displays.
- Introduce `UserCreationForm` and `UserChangeForm` for streamlined user management.
- Enhance Family model with improved string representation and made name optional.
- Add `Member.contact_email` property for prioritized email retrieval.
- Include tests for the updated Family string logic, contact email functionality, and admin integration.
- Add initial migration for club models (Club, ClubMembership) and updated migration for Family in the authentication app.
- Configure IntelliJ IDEA for local SQLite database access.

authentication/migrations/0002_alter_family_name.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-07-02 14:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('authentication', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='family',
+            name='name',
+            field=models.CharField(blank=True, max_length=255),
+        ),
+    ]