public user IDs, plans priced by tutor cost, age-based tutor tone, self-service account deletion

- profile publicId ("User482917", accounts/public_id.py); admin shows and searches it
- plans API reports aiDailyQuota per plan and freeAiDailyQuota; migration 0007 sets the
  temporary prices (monthly 99,000 / yearly 990,000 toman, 5 tutor questions a day) unless
  an admin already edited the yearly plan
- tutor tone follows the learner's age (18+ gets an adult tone at any grade); notation
  still follows the grade's book; answer cache keyed by tone (prompt tutor-v12-age-tone)
- POST /api/user/delete: phone users confirm with a fresh SMS code (same checks as login,
  now shared in verify_phone_otp), guests type "حذف"; payment records are kept, demo
  accounts refused
- delete_users --skip-paid

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

accounts/management/commands/delete_users.py

@@ -54,10 +54,13 @@ def plan(user_ids):
     return counts
 
 
-def delete_users(user_ids):
+def delete_users(user_ids, keep=()):
+    """keep: برچسبِ مدل‌هایی که نمی‌مانند پاک شوند (مثلاً 'payment.Order' برای حذفِ حسابِ خودِ کاربر)."""
     phones = list(User.objects.filter(pk__in=user_ids).exclude(phone=None).values_list('phone', flat=True))
     with transaction.atomic():
         for model, column in user_scoped_models():
+            if model._meta.label in keep:
+                continue
             model.objects.filter(**{f'{column}__in': user_ids}).delete()
         OTPCode.objects.filter(phone__in=phones).delete()
         User.objects.filter(pk__in=user_ids).delete()
@@ -74,6 +77,8 @@ class Command(BaseCommand):
         parser.add_argument('--yes', action='store_true', help='واقعاً پاک کن.')
         parser.add_argument('--include-paid', action='store_true',
                             help='کاربرِ دارای سفارشِ پرداخت‌شده را هم پاک کن.')
+        parser.add_argument('--skip-paid', action='store_true',
+                            help='کاربرِ دارای سفارشِ پرداخت‌شده را کنار بگذار و بقیه را پاک کن.')
 
     def handle(self, *args, **options):
         phones = [normalize_phone(p) or p for p in options['phones']]
@@ -93,7 +98,12 @@ class Command(BaseCommand):
         from payment.models import Order
         paid = set(Order.objects.filter(user_id__in=[u.pk for u in users], status='paid')
                    .values_list('user_id', flat=True))
-        if paid and not options['include_paid']:
+        if paid and options['skip_paid']:
+            self.stdout.write(f'کنار گذاشته شدند (سفارشِ پرداخت‌شده دارند): {sorted(paid)}')
+            users = [u for u in users if u.pk not in paid]
+            if not users:
+                raise CommandError('بعد از کنار گذاشتنِ پرداخت‌کننده‌ها کسی نماند.')
+        elif paid and not options['include_paid']:
             raise CommandError(f'کاربرهای {sorted(paid)} سفارشِ پرداخت‌شده دارند؛ با --include-paid پاک می‌شوند.')
 
         ids = [u.pk for u in users]