Add a complete DoubleSidedBench asset set: Blender source files, OBJ/MTL, Fallout 4 NIF and BGSM material files, many textures (DDS/PNG), decals and exports, and painter lock/spp LFS pointers. Remove legacy CO_DoubleSidedBench.fbx and duplicate FBX/spp files. Also reorganize VaultLeather textures into a VaultLeather subfolder and update related .blend and .spp files.
Add DoubleSidedBench assets to creation-kit/assets/DoubleSidedBench: the FBX model (CO_DoubleSidedBench2.fbx) and associated .spp file are added as Git LFS pointers, along with the Blender source file (DoubleSidedBench.blend) and its autosave/backup (DoubleSidedBench.blend1). These files provide the new double-sided bench model and source for the creation kit.