chore: address pull request review issues

app/utils/const_data/consts.go

@@ -3,6 +3,7 @@ package constdata
 // PASSWORD_VALIDATION_REGEX is used by the frontend (JavaScript supports lookaheads).
 const PASSWORD_VALIDATION_REGEX = `^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{10,}$`
 const SHOP_ID = 1
+const DEFAULT_PRODUCT_QUANTITY = 1
 const SHOP_DEFAULT_LANGUAGE = 1
 const ADMIN_NOTIFICATION_LANGUAGE = 2