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/metrics-server/modules/metrics-server/main.tf

@@ -0,0 +1,29 @@
+variable "tls_secret_name" {}
+variable "tier" { type = string }
+
+resource "kubernetes_namespace" "metrics-server" {
+  metadata {
+    name = "metrics-server"
+    labels = {
+      tier = var.tier
+    }
+  }
+}
+
+module "tls_secret" {
+  source          = "../../../../modules/kubernetes/setup_tls_secret"
+  namespace       = kubernetes_namespace.metrics-server.metadata[0].name
+  tls_secret_name = var.tls_secret_name
+}
+
+resource "helm_release" "metrics-server" {
+  namespace        = kubernetes_namespace.metrics-server.metadata[0].name
+  create_namespace = false
+  name             = "metrics-server"
+  atomic           = true
+
+  repository = "https://kubernetes-sigs.github.io/metrics-server/"
+  chart      = "metrics-server"
+
+  values = [templatefile("${path.module}/values.yaml", {})]
+}

stacks/metrics-server/modules/metrics-server/values.yaml

@@ -0,0 +1,8 @@
+args:
+  - "--kubelet-insecure-tls"
+resources:
+  requests:
+    cpu: 50m
+    memory: 200Mi
+  limits:
+    memory: 200Mi