refactor: simplify homelab bootstrap around static IPs and fresh runs

Make Terraform the source of truth for node IPs, remove guest-agent/SSH discovery from the normal workflow path, simplify the bootstrap controller to a fresh-run flow, and swap the initial CNI to Flannel so cluster readiness is easier to prove before reintroducing more complex reconcile behavior.

terraform/outputs.tf

@@ -11,8 +11,8 @@ output "control_plane_vm_names" {
 
 output "control_plane_vm_ipv4" {
   value = {
-    for vm in proxmox_vm_qemu.control_planes :
-    vm.name => vm.default_ipv4_address
+    for i in range(var.control_plane_count) :
+    proxmox_vm_qemu.control_planes[i].name => var.control_plane_ips[i]
   }
 }
 
@@ -29,7 +29,7 @@ output "worker_vm_names" {
 
 output "worker_vm_ipv4" {
   value = {
-    for vm in proxmox_vm_qemu.workers :
-    vm.name => vm.default_ipv4_address
+    for i in range(var.worker_count) :
+    proxmox_vm_qemu.workers[i].name => var.worker_ips[i]
   }
 }