fix: Bankuai 从 rank.models 导入，修复 migrate 启动失败

jituan/services/finance_detail_stats.py

@@ -13,7 +13,8 @@ from jituan.services.club_context import (
 )
 from jituan.services.club_penalty import filter_gsfenhong_qs, filter_penalty_qs
 from orders.models import Order, Penalty
-from products.models import Bankuai, Czjilu, Gsfenhong, Huiyuan, ShangpinLeixing
+from products.models import Czjilu, Gsfenhong, Huiyuan, ShangpinLeixing
+from rank.models import Bankuai
 
 
 def _meta(request):