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/terraform.tfvars

@@ -1,12 +1,10 @@
 target_node    = "flex"
 clone_template = "ubuntu-cloudinit"
-vm_name        = "alpine-vm"
 cores          = 1
 memory         = 1024
 disk_size      = "15G"
 sockets        = 1
 bridge         = "vmbr0"
-disk_type      = "scsi"
 storage        = "Flash"
 pm_api_url     = "https://100.105.0.115:8006/api2/json"
-pm_user        = "terraform-prov@pve"
+pm_user        = "terraform-prov@pve"