Remove the guest system entirely: no is_guest/device_id, no guest throttles, phone login is the only way in

accounts.0008 drops the columns and refuses to run while guest rows exist.
Docs describe the current state; tests that only proved guest behaviour are gone.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

payment/tests_audit_fixes.py

@@ -23,7 +23,7 @@ from subscription.models import Plan, Subscription
 class _Base(TestCase):
     def setUp(self):
         cache.clear()
-        self.user = User.objects.create(phone='09120007001', is_guest=False)
+        self.user = User.objects.create(phone='09120007001')
         self.client = APIClient()
         self.client.credentials(HTTP_AUTHORIZATION=f'Bearer {issue_access_token(self.user.id)}')
         self.month = Plan.objects.create(title='ماهانه', price=49000, duration_days=30)
@@ -137,7 +137,7 @@ class ReconcileTests(_Base):
 class AffiliateTests(_Base):
     def setUp(self):
         super().setUp()
-        self.referrer = User.objects.create(phone='09120007002', is_guest=False)
+        self.referrer = User.objects.create(phone='09120007002')
         self.account = AffiliateAccount.objects.create(user_id=self.referrer.id, referral_code='SARA10',
                                                        commission_rate=0.1)
 
@@ -157,11 +157,3 @@ class AffiliateTests(_Base):
         me = referrer.get('/api/affiliate/me').json()
         self.assertEqual((me['referredCount'], me['paidCount'], me['totalCommission']), (1, 1, 4900))
 
-    def test_guests_take_no_part(self):
-        guest = User.objects.create(device_id='dev-aff', is_guest=True)
-        client = APIClient()
-        client.credentials(HTTP_AUTHORIZATION=f'Bearer {issue_access_token(guest.id)}')
-        self.assertEqual(client.post('/api/affiliate/track', {'referralCode': 'SARA10'},
-                                     format='json').status_code, 403)
-        self.assertEqual(client.get('/api/affiliate/me').status_code, 403)
-        self.assertFalse(Conversion.objects.exists())