refactor(vars): add system/hypervisor dict inputs

- Normalize new system_cfg + hypervisor_cfg and keep legacy vm_* and hypervisor_* aliases

- Support multiple system.disks (creation + optional mount + fstab generation)

- Add system_check safety role (production + existing system detection)

- Update README and example inventories

roles/cleanup/tasks/libvirt.yml

@@ -102,3 +102,5 @@
       delegate_to: "{{ inventory_hostname }}"
       ansible.builtin.wait_for_connection:
         timeout: 300
+      failed_when: false
+      changed_when: false