fix: 回填命令兼容 FluentQuery（不用 iterator）

Co-authored-by: Cursor <cursoragent@cursor.com>

jituan/management/commands/backfill_member_trial_flags.py

@@ -24,17 +24,17 @@ class Command(BaseCommand):
         czjilu_fixed = 0
         goumai_fixed = 0
 
-        member_orders = Czjilu.query.filter(leixing=1, zhuangtai=3)
+        member_orders = list(Czjilu.query.filter(leixing=1, zhuangtai=3))
         with transaction.atomic():
-            for order in member_orders.iterator():
+            for order in member_orders:
                 club_id = getattr(order, 'club_id', None)
                 if _order_is_trial_like(order, club_id) and not order.is_trial:
                     czjilu_fixed += 1
                     if not dry_run:
                         Czjilu.query.filter(dingdan_id=order.dingdan_id).update(is_trial=True)
 
-            goumai_rows = Huiyuangoumai.query.all()
-            for row in goumai_rows.iterator():
+            goumai_rows = list(Huiyuangoumai.query.all())
+            for row in goumai_rows:
                 if row.has_used_trial:
                     continue
                 if has_paid_trial_purchase(row.yonghu_id, row.huiyuan_id, row.club_id):