🗃️(models) create abstract BaseInvitation and DomainInvitation models

create abstract BaseInvitation models to factorize common elements between
existing Invitation model team-side and new DomainInvitation model

src/backend/mailbox_manager/migrations/0024_domaininvitation.py

@@ -0,0 +1,35 @@
+# Generated by Django 5.1.5 on 2025-02-07 17:27
+
+import django.db.models.deletion
+import uuid
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mailbox_manager', '0023_mailbox_email_mailbox_last_login_mailbox_password'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='DomainInvitation',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, help_text='primary key for the record as UUID', primary_key=True, serialize=False, verbose_name='id')),
+                ('created_at', models.DateTimeField(auto_now_add=True, help_text='date and time at which a record was created', verbose_name='created at')),
+                ('updated_at', models.DateTimeField(auto_now=True, help_text='date and time at which a record was last updated', verbose_name='updated at')),
+                ('email', models.EmailField(max_length=254, verbose_name='email address')),
+                ('role', models.CharField(choices=[('viewer', 'Viewer'), ('administrator', 'Administrator'), ('owner', 'Owner')], default='viewer', max_length=20)),
+                ('domain', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='domain_invitations', to='mailbox_manager.maildomain')),
+                ('issuer', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='domain_invitations', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'verbose_name': 'Domain invitation',
+                'verbose_name_plural': 'Domain invitations',
+                'db_table': 'people_domain_invitation',
+                'constraints': [models.UniqueConstraint(fields=('email', 'domain'), name='email_and_domain_unique_together')],
+            },
+        ),
+    ]