统一将 bms_region 替换为 region，更新相关注释和文档以反映这一变化。

bms-front/src/api/price/zone.js

@@ -1,6 +1,6 @@
 import request from '@/utils/request'
 
-// ========== countries that have zones (from bms_region) ==========
+// ========== countries that have zones (from region) ==========
 
 export function listCountry(query) {
   return request({
@@ -17,7 +17,7 @@ export function getCountry(regionId) {
   })
 }
 
-/** Delete all zones + postcodes for region(s); does not delete bms_region */
+/** Delete all zones + postcodes for region(s); does not delete region */
 export function delCountryZones(regionIds) {
   return request({
     url: '/price/zone/country/' + regionIds,