Add specialized assemblies for excavation work

Users are requesting the addition of standard and more specific assemblies for excavation work (calculation of footings, ground slabs, perimeter trenches, surface excavation, French drains, etc.). Currently, advanced calculation templates exist for excavation specialists, but they often need to be configured or transferred manually by technical support. It would be beneficial to standardize these excavation assemblies so that all contractors can easily access and use them directly from the catalog.