feat: derive event lifecycle status from dates and flags

Replace persisted event statuses with publication and cancellation flags, and compute public lifecycle labels from event timing and registration capacity. Keep filters, registration checks, and profile responses aligned with the derived status.

apps/payments/tests/integration/test_payments.py

@@ -22,14 +22,16 @@ class TestPaymentsAPIIntegrationTests:
 
     def setup_method(self):
         type(self).setUpTestData()
-        self.event = Event.objects.create(title='Pay Event', description='Payment event', start_time=timezone.now(), end_time=timezone.now() + timedelta(hours=2), registration_start_date=timezone.now() - timedelta(days=1), registration_end_date=timezone.now() + timedelta(days=1), slug='pay-event', price=50000, capacity=10, status=Event.StatusChoices.PUBLISHED)
+        now = timezone.now()
+        self.event = Event.objects.create(title='Pay Event', description='Payment event', start_time=now + timedelta(days=2), end_time=now + timedelta(days=2, hours=2), registration_start_date=now - timedelta(days=1), registration_end_date=now + timedelta(days=1), slug='pay-event', price=50000, capacity=10, is_published=True)
         self.token = create_jwt_token(self.user)
 
     def _headers(self):
         return {'HTTP_AUTHORIZATION': f'Bearer {self.token}'}
 
     def _create_paid_event(self):
-        return Event.objects.create(title='Paid Event', description='Paid', start_time=timezone.now(), end_time=timezone.now() + timedelta(hours=1), registration_start_date=timezone.now() - timedelta(days=1), registration_end_date=timezone.now() + timedelta(days=2), slug=f'paid-{timezone.now().timestamp()}', price=20000, capacity=5, status=Event.StatusChoices.PUBLISHED)
+        now = timezone.now()
+        return Event.objects.create(title='Paid Event', description='Paid', start_time=now + timedelta(days=2), end_time=now + timedelta(days=2, hours=1), registration_start_date=now - timedelta(days=1), registration_end_date=now + timedelta(days=1), slug=f'paid-{now.timestamp()}', price=20000, capacity=5, is_published=True)
 
     def _create_discount_code(self, event):
         code = DiscountCode.objects.create(code='DISC50', value=50, is_active=True)
@@ -37,7 +39,8 @@ class TestPaymentsAPIIntegrationTests:
         return code
 
     def test_create_payment_for_free_event(self):
-        free = Event.objects.create(title='Free', description='Zero', start_time=timezone.now(), end_time=timezone.now() + timedelta(hours=1), registration_start_date=timezone.now() - timedelta(days=1), registration_end_date=timezone.now() + timedelta(days=1), slug='free-event', price=0, capacity=10, status=Event.StatusChoices.PUBLISHED)
+        now = timezone.now()
+        free = Event.objects.create(title='Free', description='Zero', start_time=now + timedelta(days=2), end_time=now + timedelta(days=2, hours=1), registration_start_date=now - timedelta(days=1), registration_end_date=now + timedelta(days=1), slug='free-event', price=0, capacity=10, is_published=True)
         response = self.client.post('/api/payments/create', data=json.dumps({'event_id': free.id, 'description': 'Free registration'}), content_type='application/json', **self._headers())
         assert response.status_code == 200
         data = response.json()