terraform: add parameterized multi-VM deployment system

Implements Phase 1 of the OpenTofu deployment plan:
- Replace single-VM configuration with locals-based for_each pattern
- Support multiple VMs in single deployment
- Automatic DHCP vs static IP detection
- Configurable defaults with per-VM overrides
- Dynamic outputs for VM IPs and specifications

New files:
- outputs.tf: Dynamic outputs for deployed VMs
- vms.tf: VM definitions using locals.vms map

Updated files:
- variables.tf: Added default variables for VM configuration
- README.md: Comprehensive documentation and examples

Removed files:
- vm.tf: Replaced by new vms.tf (archived as vm.tf.old, then removed)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

terraform/variables.tf

@@ -20,3 +20,78 @@ variable "proxmox_tls_insecure" {
   type        = bool
   default     = true
 }
+
+# Default values for VM configurations
+# These can be overridden per-VM in vms.tf
+
+variable "default_target_node" {
+  description = "Default Proxmox node to deploy VMs to"
+  type        = string
+  default     = "pve1"
+}
+
+variable "default_template_name" {
+  description = "Default template VM name to clone from"
+  type        = string
+  default     = "nixos-25.11.20260128.fa83fd8"
+}
+
+variable "default_ssh_public_key" {
+  description = "Default SSH public key for root user"
+  type        = string
+  default     = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAwfb2jpKrBnCw28aevnH8HbE5YbcMXpdaVv2KmueDu6 torjus@gunter"
+}
+
+variable "default_storage" {
+  description = "Default storage backend for VM disks"
+  type        = string
+  default     = "local-zfs"
+}
+
+variable "default_bridge" {
+  description = "Default network bridge"
+  type        = string
+  default     = "vmbr0"
+}
+
+variable "default_vlan_tag" {
+  description = "Default VLAN tag"
+  type        = number
+  default     = 13
+}
+
+variable "default_gateway" {
+  description = "Default network gateway for static IP VMs"
+  type        = string
+  default     = "10.69.13.1"
+}
+
+variable "default_nameservers" {
+  description = "Default DNS nameservers"
+  type        = string
+  default     = "10.69.13.5 10.69.13.6"
+}
+
+variable "default_search_domain" {
+  description = "Default DNS search domain"
+  type        = string
+  default     = "home.2rjus.net"
+}
+
+variable "default_cpu_cores" {
+  description = "Default number of CPU cores"
+  type        = number
+  default     = 2
+}
+
+variable "default_memory" {
+  description = "Default memory in MB"
+  type        = number
+  default     = 2048
+}
+
+variable "default_disk_size" {
+  description = "Default disk size"
+  type        = string
+  default     = "20G"
+}