- add `Lain-lain` option to the Electronic Equipment Type dropdown on the add order page
- add Model Number input field on the add order page
- position Model Number field after Electronic Equipment Type, before Size
- add Model Number row on the order profile page (detail-services)
- add Additional Items row on the order profile page (detail-services)
- add Checking Fee (RM) row on the order profile page (detail-services)
- update JS to populate `model_number` field from API response
- update JS to populate `additional_items` field with comma separated format
- update JS to populate `checking_cost` field with MYR currency format
- add `-` fallback if field is empty or null for all three new fields
- verify controller requires no changes as fields already exist in validation and create logic