test: migrate backend suites to pytest with module coverage gate

Split backend tests into unit and integration suites, add isolated fixtures and coverage enforcement, and update CI and test documentation. Cover current authentication, content, notification, payment, media, and admin flows; fix behaviors revealed by the new tests. Validate both suites and the per-module gate against local PostgreSQL.

apps/events/tests/unit/test_event_notifications.py

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+import pytest
+from types import SimpleNamespace
+from datetime import timedelta
+from django.contrib import admin
+from django.utils import timezone
+from apps.events.admin import EventAdmin, RegistrationAdmin
+from apps.events.models import Event, Registration
+from apps.events.tasks import send_registration_cancellation_notification, send_registration_confirmation_notification
+from apps.users.models import User
+
+@pytest.mark.unit
+class TestAutomaticRegistrationNotificationTests:
+
+    def test_confirmation_delivers_in_app_with_event_link(self, mocker):
+        registrations = mocker.patch('apps.events.tasks.Registration.objects')
+        notify_user = mocker.patch('apps.events.tasks.notify_user')
+        registration = SimpleNamespace(user_id=7, event_id=12, ticket_id='ticket', event=SimpleNamespace(title='Workshop', slug='workshop'))
+        registrations.select_related.return_value.get.return_value = registration
+        result = send_registration_confirmation_notification.run('1')
+        assert result == {'sent': True}
+        assert notify_user.call_args.args[0] == 7
+        assert notify_user.call_args.args[1]['action_url'] == '/events/workshop'
+
+    def test_cancellation_delivers_in_app_and_optional_sms(self, mocker):
+        registrations = mocker.patch('apps.events.tasks.Registration.objects')
+        notify_user = mocker.patch('apps.events.tasks.notify_user')
+        send_sms = mocker.patch('apps.events.tasks.send_critical_sms.delay')
+        registrations.select_related.return_value.get.return_value = SimpleNamespace(user_id=7, event_id=12, user=SimpleNamespace(mobile='09191110002', is_mobile_verified=True), event=SimpleNamespace(title='Workshop', slug='workshop'))
+        assert send_registration_cancellation_notification.run('1') == {'sent': True}
+        assert notify_user.call_args.args[1]['type'] == 'event_cancellation'
+        send_sms.assert_called_once_with('09191110002', 'event_cancellation', 'Workshop')
+
+    def test_cancellation_skips_sms_for_unverified_mobile(self, mocker):
+        registrations = mocker.patch('apps.events.tasks.Registration.objects')
+        mocker.patch('apps.events.tasks.notify_user')
+        send_sms = mocker.patch('apps.events.tasks.send_critical_sms.delay')
+        registrations.select_related.return_value.get.return_value = SimpleNamespace(
+            user_id=7, event_id=12,
+            user=SimpleNamespace(mobile='09191110002', is_mobile_verified=False),
+            event=SimpleNamespace(title='Workshop', slug='workshop'),
+        )
+        assert send_registration_cancellation_notification.run('1') == {'sent': True}
+        send_sms.assert_not_called()
+
+    def test_confirmation_failure_requests_retry(self, mocker):
+        registrations = mocker.patch('apps.events.tasks.Registration.objects')
+        registrations.select_related.return_value.get.side_effect = Registration.DoesNotExist()
+        retry = mocker.patch.object(
+            send_registration_confirmation_notification, 'retry', side_effect=RuntimeError('retry requested')
+        )
+        with pytest.raises(RuntimeError, match='retry requested'):
+            send_registration_confirmation_notification.run('missing')
+        assert retry.call_args.kwargs['countdown'] == 60
+
+@pytest.mark.unit
+class TestManualActionRemovalTests:
+
+    def test_event_and_registration_admin_have_no_manual_send_actions(self):
+        assert not EventAdmin.__dict__.get('actions_row')
+        assert not RegistrationAdmin.__dict__.get('actions_row')
+
+    def test_bulk_status_actions_save_each_registration_for_automatic_notification(self, mocker):
+        model_admin = RegistrationAdmin(Registration, admin.site)
+        registration = mocker.Mock()
+        mocker.patch.object(model_admin, 'message_user')
+        model_admin.confirm_registrations(SimpleNamespace(), [registration])
+        assert registration.status == Registration.StatusChoices.CONFIRMED
+        registration.save.assert_called_with(update_fields=['status'])
+        registration.reset_mock()
+        model_admin.cancel_registrations(SimpleNamespace(), [registration])
+        assert registration.status == Registration.StatusChoices.CANCELLED
+        registration.save.assert_called_with(update_fields=['status'])