feat: refactor infra to cp/wk kubeadm topology

Provision 3 thin control planes and 3 workers with role-specific sizing and VMID ranges (701/711), generate per-node cloud-init snippets with SSH key injection, and add NixOS kubeadm host/module scaffolding for cp-1..3 and wk-1..3.

terraform/outputs.tf

@@ -1,21 +1,21 @@
-output "alpaca_vm_ids" {
+output "control_plane_vm_ids" {
   value = {
-    for i in range(var.alpaca_vm_count) :
-    "alpaca-${i + 1}" => proxmox_vm_qemu.alpacas[i].vmid
+    for i in range(var.control_plane_count) :
+    "cp-${i + 1}" => proxmox_vm_qemu.control_planes[i].vmid
   }
 }
 
-output "alpaca_vm_names" {
-  value = [for vm in proxmox_vm_qemu.alpacas : vm.name]
+output "control_plane_vm_names" {
+  value = [for vm in proxmox_vm_qemu.control_planes : vm.name]
 }
 
-output "llama_vm_ids" {
+output "worker_vm_ids" {
   value = {
-    for i in range(var.llama_vm_count) :
-    "llama-${i + 1}" => proxmox_vm_qemu.llamas[i].vmid
+    for i in range(var.worker_count) :
+    "wk-${i + 1}" => proxmox_vm_qemu.workers[i].vmid
   }
 }
 
-output "llama_vm_names" {
-  value = [for vm in proxmox_vm_qemu.llamas : vm.name]
+output "worker_vm_names" {
+  value = [for vm in proxmox_vm_qemu.workers : vm.name]
 }