feat: migrate cluster baseline from Hetzner to Proxmox

Replace Hetzner infrastructure and cloud-provider assumptions with Proxmox
VM clones, kube-vip API HA, and NFS-backed storage. Update bootstrap,
Flux addons, CI workflows, and docs to target the new private Proxmox
baseline while preserving the existing Tailscale, Doppler, Flux, Rancher,
and B2 backup flows.

ansible/roles/k3s-server/defaults/main.yml

@@ -3,9 +3,10 @@ k3s_version: latest
 k3s_token: ""
 k3s_node_ip: ""
 k3s_primary_public_ip: ""
-k3s_disable_embedded_ccm: true
+k3s_disable_embedded_ccm: false
 k3s_disable_servicelb: true
-k3s_kubelet_cloud_provider_external: true
+k3s_kubelet_cloud_provider_external: false
+k3s_flannel_iface: ens18
 # Load Balancer endpoint for HA cluster joins (set in inventory)
 kube_api_endpoint: ""
 # Tailscale DNS names for control planes (to enable tailnet access)