[ci skip] Flatten module wrappers into stack roots

Remove the module "xxx" { source = "./module" } indirection layer
from all 66 service stacks. Resources are now defined directly in
each stack's main.tf instead of through a wrapper module.

- Merge module/main.tf contents into stack main.tf
- Apply variable replacements (var.tier -> local.tiers.X, renamed vars)
- Fix shared module paths (one fewer ../ at each level)
- Move extra files/dirs (factory/, chart_values, subdirs) to stack root
- Update state files to strip module.<name>. prefix
- Update CLAUDE.md to reflect flat structure

Verified: terragrunt plan shows 0 add, 0 destroy across all stacks.

stacks/homepage/main.tf

@@ -10,8 +10,30 @@ locals {
   }
 }
 
-module "homepage" {
-  source          = "./module"
-  tier            = local.tiers.aux
+module "tls_secret" {
+  source          = "../../modules/kubernetes/setup_tls_secret"
+  namespace       = kubernetes_namespace.homepage.metadata[0].name
   tls_secret_name = var.tls_secret_name
 }
+
+resource "kubernetes_namespace" "homepage" {
+  metadata {
+    name = "homepage"
+    labels = {
+      "istio-injection" : "disabled"
+      tier = local.tiers.aux
+    }
+  }
+}
+
+resource "helm_release" "homepage" {
+  namespace        = kubernetes_namespace.homepage.metadata[0].name
+  create_namespace = false
+  name             = "homepage"
+  atomic           = true
+
+  repository = "http://jameswynn.github.io/helm-charts"
+  chart      = "homepage"
+
+  values = [templatefile("${path.module}/values.yaml", { tls_secret_name = var.tls_secret_name })]
+}