fix: code quality improvements

- Remove duplicate variables (alpaca_count, llama_count)
- Remove unused variables (vm_name, disk_type)
- Fix outputs to use correct variable names
- Fix cloud-init template to not overwrite source file
- Fix hardcoded hostname in cloud-init template
- Fix typo in SSH_KEY_PUBLIC description

terraform/cloud-init.tf

@@ -1,7 +1,5 @@
-### Global cloud-init template (for all VMs)
-
 data "template_file" "cloud_init_global" {
-  template = file("${path.module}/files/cloud_init_global.yaml")
+  template = file("${path.module}/files/cloud_init_global.tpl")
 
   vars = {
     hostname       = "generic"
@@ -13,5 +11,5 @@ data "template_file" "cloud_init_global" {
 
 resource "local_file" "cloud_init_global" {
   content  = data.template_file.cloud_init_global.rendered
-  filename = "${path.module}/files/cloud_init_global.yaml"
+  filename = "${path.module}/files/rendered/cloud_init_global.yaml"
 }