refactor: centralize protobuf and remove go-zero

module/ec/order/proto/coupon.proto

@@ -1,7 +1,6 @@
 syntax = "proto3";
 package order;
-option go_package = "./order"; 
-import "blocks.proto";
+option go_package = "bsm/full/module/ec/order/pb;order";
 
 // Order(订单)微服务-优惠卷
 service Coupon {
@@ -27,4 +26,4 @@ message CouponItem{
   string  started =6; // 开始时间
   string  expired =7; // 结束时间
   string  status =8; // 状态
-}
+}