chore: stabilize lint and verify builds

backend/pkg/consts/coupon.go

@@ -25,6 +25,7 @@ func CouponTypeItems() []requests.KV {
 	for _, v := range values {
 		items = append(items, requests.NewKV(string(v), v.Description()))
 	}
+
 	return items
 }
 
@@ -53,5 +54,6 @@ func UserCouponStatusItems() []requests.KV {
 	for _, v := range values {
 		items = append(items, requests.NewKV(string(v), v.Description()))
 	}
+
 	return items
 }