extract remaining 19 modules from platform, complete stack split [ci skip]

Phase 3: all 27 platform modules now run as independent stacks.
Platform reduced to empty shell (outputs only) for backward compat
with 72 app stacks that declare dependency "platform".
Fixed technitium cross-module dashboard reference by copying file.
Woodpecker pipeline applies all 27+1 stacks in parallel via loop.
All applied with zero destroys.

stacks/wireguard/main.tf

@@ -0,0 +1,15 @@
+variable "tls_secret_name" { type = string }
+
+data "vault_kv_secret_v2" "secrets" {
+  mount = "secret"
+  name  = "platform"
+}
+
+module "wireguard" {
+  source          = "./modules/wireguard"
+  tls_secret_name = var.tls_secret_name
+  wg_0_conf       = data.vault_kv_secret_v2.secrets.data["wireguard_wg_0_conf"]
+  wg_0_key        = data.vault_kv_secret_v2.secrets.data["wireguard_wg_0_key"]
+  firewall_sh     = data.vault_kv_secret_v2.secrets.data["wireguard_firewall_sh"]
+  tier            = local.tiers.core
+}