fix(auth): 补 Auth/SetDefaultRole 根路由入口

- 默认角色接口此前只挂了 ugm 子路由（api/ugm/set-default-role/），
  前端 POST /Auth/SetDefaultRole 405；根 urls 补 PascalCase 路由对齐

gvsds/urls.py

@@ -44,6 +44,7 @@ urlpatterns = [
     path('Auth/RefreshToken', ugm_views.CookieTokenRefreshView.as_view(), name='auth_refresh'),
     path('Auth/GetUserRoles', ugm_views.GetUserRolesView.as_view(), name='auth_user_roles'),
     path('Auth/SwitchRole', ugm_views.SwitchRoleView.as_view(), name='auth_switch_role'),
+    path('Auth/SetDefaultRole', ugm_views.SetDefaultRoleView.as_view(), name='auth_set_default_role'),
     path('Query/GetELTUserAvatar', ugm_views.GetUserAvatarView.as_view(), name='query_avatar'),
     path('Query/GetArgsUserAvatar', ugm_views.GetArgsUserAvatarView.as_view(), name='query_avatar_by_uuid'),
     path('Query/GetELTUserInfo', ugm_views.GetUserInfoView.as_view(), name='query_user_info'),