[ci skip] Move Terraform modules into stack directories

Move all 88 service modules (66 individual + 22 platform) from
modules/kubernetes/<service>/ into their corresponding stack directories:

- Service stacks: stacks/<service>/module/
- Platform stack: stacks/platform/modules/<service>/

This collocates module source code with its Terragrunt definition.
Only shared utility modules remain in modules/kubernetes/:
ingress_factory, setup_tls_secret, dockerhub_secret, oauth-proxy.

All cross-references to shared modules updated to use correct
relative paths. Verified with terragrunt run --all -- plan:
0 adds, 0 destroys across all 68 stacks.

stacks/reloader/module/main.tf

@@ -0,0 +1,19 @@
+variable "tier" { type = string }
+
+resource "kubernetes_namespace" "crowdsec" {
+  metadata {
+    name = "reloader"
+    labels = {
+      tier = var.tier
+    }
+  }
+}
+resource "helm_release" "reloader" {
+  namespace        = kubernetes_namespace.crowdsec.metadata[0].name
+  create_namespace = false
+  name             = "reloader"
+  atomic           = true
+
+  repository = "https://stakater.github.io/stakater-charts"
+  chart      = "reloader"
+}