chore(prod): remove netlab vm configuration from tfvars

Remove the configuration for the "netlab" virtual machine (192.168.1.161).
This clears the virtual_machines map in the production environment, effectively decommissioning the instance.

terraform/prod/terraform.tfvars

@@ -33,17 +33,7 @@ admin_ssh_public_key_path = "~/.ssh/keys/id_rsa.pub"
 # Utilisateur par défaut sur les VMs
 default_vm_user = "damien"
 
-virtual_machines = {
-  "netlab" = {
-    os      = "debian"
-    cores   = 8
-    memory  = 24576
-    disk_gb = 64
-    ip      = "192.168.1.161"
-    gateway = "192.168.1.254"
-    tags    = ["netlab"]
-  }
-}
+virtual_machines = {}
 
 #############################
 # Notes de configuration