fix(terraform): Configure storage for LINSTOR cluster topology

Storage configuration changes:
- Add full_clone=true for better LINSTOR compatibility
- Add replicate=1 to disk config for k3s servers on LINSTOR
- Configure etcd-witness to use local-lvm storage on thinkpad
- Add etcd_witness_storage_pool variable with local-lvm default

Fixes:
- etcd-witness now uses local storage since thinkpad is LINSTOR controller only
- k3s-server-1 and k3s-server-2 use LINSTOR replicated storage on acemagician/elitedesk
- Explicit replication flag helps LINSTOR create resources correctly

terraform/pve2/main.tf

@@ -25,6 +25,7 @@ resource "proxmox_vm_qemu" "k3s_server_2" {
   name        = "k3s-server-2"
   target_node = "elitedesk"
   clone       = var.ubuntu_template
+  full_clone  = true
 
   cpu {
     cores   = var.k3s_server_2_config.cores
@@ -50,6 +51,7 @@ resource "proxmox_vm_qemu" "k3s_server_2" {
     type     = "disk"
     storage  = var.storage_pool
     iothread = true
+    replicate = 1
   }
 
   ipconfig0  = "ip=${var.k3s_server_2_config.ip},gw=${var.k3s_gateway}"