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/partitioning/defaults/main.yml

@@ -119,7 +119,13 @@ partitioning_vm_size_effective: >-
     (
       partitioning_vm_size
       if (partitioning_vm_size is defined and (partitioning_vm_size | float) > 0)
-      else (vm_size if vm_size is defined else 0)
+      else (
+        (
+          (system_cfg.disks | default([]) | first | default({})).size
+          if system_cfg is defined
+          else 0
+        ) | default(0)
+      )
     )
     | float
   }}
@@ -128,7 +134,10 @@ partitioning_vm_memory_effective: >-
     (
       partitioning_vm_memory
       if (partitioning_vm_memory is defined and (partitioning_vm_memory | float) > 0)
-      else (vm_memory if vm_memory is defined else 0)
+      else (
+        (system_cfg.memory_mb if system_cfg is defined else 0)
+        | default(0)
+      )
     )
     | float
   }}