Upload 3D shutter and handle models via the admin portal

Add 3D shutter and custom handle models to the catalogue by uploading them through the admin portal.

1. 3D shutter models are uploaded through the admin portal: open Hardware on the left-hand side and then the shutter section.

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2. Custom handle 3D models can be added to the catalogue by uploading them through the admin portal, allowing non-standard handles to be used in designs.

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