Remove storage type detection and explicit pvesm alloc/qm set steps, and inline EFI/disk/CD configuration into the initial qm create call. Uses unified storage refs (efidisk0 ${STORAGE}:1,efitype=4m,pre-enrolled-keys=0 and scsi0 ${STORAGE}:${DISK_SIZE},${DISK_CACHE}${THIN%,}) and sets the ISO via -cdrom local:iso/${FILENAME}. Adds a success message and streamlines VM creation by eliminating per-storage branching and manual allocation logic.