feat: 后台添加商家 + 龙先生 lsx 俱乐部/邀请链种子

支持客服按用户UID开通商家（分俱乐部校验）；新增 seed_club_lsx、seed_lsx_invite_data。

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

jituan/urls.py

@@ -18,6 +18,7 @@ from backend.view import (
     KhgglView,
     KefuGetDashouListView,
     KefuGetShangjiaListView,
+    KefuAddShangjiaView,
     PopupNoticeListAPIView,
     PopupNoticeModifyAPIView,
     ShgxgsjView,
@@ -123,6 +124,7 @@ urlpatterns = [
     path('houtai/kefuhqdslb', KefuGetDashouListView.as_view(), name='jituan_dashou_list'),
     path('houtai/hthqgslb', GetGuanliListView.as_view(), name='jituan_guanshi_list'),
     path('houtai/hqsjgllb', KefuGetShangjiaListView.as_view(), name='jituan_shangjia_list'),
+    path('houtai/tjsj', KefuAddShangjiaView.as_view(), name='jituan_shangjia_add'),
     path('houtai/hthqzzlb', GetZuzhangListView.as_view(), name='jituan_zuzhang_list'),
     path('houtai/lunbo-list', ClubLunboListView.as_view(), name='jituan_lunbo_list'),
     path('houtai/lunbo-manage', ClubLunboManageView.as_view(), name='jituan_lunbo_manage'),