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/partitioning/tasks/xfs.yml

@@ -6,8 +6,8 @@
     fstype: xfs
     force: true
   loop:
-    - {lv: root}
-    - {lv: home}
-    - {lv: var}
-    - {lv: var_log}
-    - {lv: var_log_audit}
+    - { lv: root }
+    - { lv: home }
+    - { lv: var }
+    - { lv: var_log }
+    - { lv: var_log_audit }