trade：优化运费模版的实现

(cherry picked from commit a9bbbc7b0a)

src/api/system/area/index.ts

@@ -5,14 +5,6 @@ export const getAreaTree = async () => {
   return await request.get({ url: '/system/area/tree' })
 }
 
-export const getChildrenArea = async (id: number) => {
-  return await request.get({ url: '/system/area/get-children?id=' + id })
-}
-
-export const getAreaListByIds = async (ids) => {
-  return await request.get({ url: '/system/area/get-by-ids?ids=' + ids })
-}
-
 // 获得 IP 对应的地区名
 export const getAreaByIp = async (ip: string) => {
   return await request.get({ url: '/system/area/get-by-ip?ip=' + ip })