feat(fastpass): Talos cluster provisioning and bootstrap

- Terraform: VM provisioning, Unifi DHCP, Technitium DNS
- talhelper: cluster config for 6-node Talos cluster
- Cilium 1.19.4 CNI with Talos-compatible security context
- docs: city-hall setup guide and bootstrap runbook

terraform/talos/modules/node/providers.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    proxmox = {
+      source  = "bpg/proxmox"
+      version = ">= 0.74.0"
+    }
+  }
+}