refactor(vars): remove legacy variable inputs

- Require hypervisor as dict input and use hypervisor_cfg/hypervisor_type internally

- Remove vm_* and hypervisor_* compatibility aliases

- Update roles and docs to use system/hypervisor dictionaries only

roles/cleanup/tasks/libvirt.yml

@@ -1,6 +1,6 @@
 ---
 - name: Remove Archiso and cloud-init disks
-  when: hypervisor == "libvirt"
+  when: hypervisor_type == "libvirt"
   delegate_to: localhost
   become: false
   block: