Link carcass and back panel to one finish code

Link materials, finishes and thickness properties in the admin portal so the system applies them automatically, then define the prelam board unit and set its properties.

1. In the admin portal, link materials, finishes and thickness properties so the system applies them automatically.

   ✓ 2026년 10월 16일에 제품에서 확인됨

2. Define the prelam board unit and set properties such as lamination type (internal or external).

   ✓ 2026년 10월 16일에 제품에서 확인됨