[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/diun/module/main.tf

@@ -0,0 +1,177 @@
+variable "tls_secret_name" {}
+variable "tier" { type = string }
+variable "diun_nfty_token" {}
+variable "diun_slack_url" {}
+
+resource "kubernetes_namespace" "diun" {
+  metadata {
+    name = "diun"
+    labels = {
+      "istio-injection" : "disabled"
+      tier = var.tier
+    }
+  }
+}
+
+module "tls_secret" {
+  source          = "../../../modules/kubernetes/setup_tls_secret"
+  namespace       = kubernetes_namespace.diun.metadata[0].name
+  tls_secret_name = var.tls_secret_name
+}
+
+resource "kubernetes_service_account" "diun" {
+  metadata {
+    name      = "diun"
+    namespace = kubernetes_namespace.diun.metadata[0].name
+  }
+}
+
+resource "kubernetes_cluster_role" "diun" {
+  metadata {
+    name = "diun"
+  }
+  rule {
+    api_groups = [""]
+    resources  = ["pods"]
+    verbs      = ["get", "watch", "list"]
+  }
+}
+resource "kubernetes_cluster_role_binding" "diun" {
+  metadata {
+    name = "diun"
+
+  }
+  role_ref {
+    api_group = "rbac.authorization.k8s.io"
+    kind      = "ClusterRole"
+    name      = "diun"
+  }
+  subject {
+    kind      = "ServiceAccount"
+    name      = "diun"
+    namespace = kubernetes_namespace.diun.metadata[0].name
+  }
+}
+
+resource "kubernetes_deployment" "diun" {
+  metadata {
+    name      = "diun"
+    namespace = kubernetes_namespace.diun.metadata[0].name
+    labels = {
+      app  = "diun"
+      tier = var.tier
+    }
+    annotations = {
+      "reloader.stakater.com/search" = "true"
+      "diun.enable"                  = "true"
+    }
+  }
+  spec {
+    replicas = 1
+    selector {
+      match_labels = {
+        app = "diun"
+      }
+    }
+    template {
+      metadata {
+        labels = {
+          app = "diun"
+        }
+      }
+      spec {
+        service_account_name = "diun"
+        container {
+          image = "crazymax/diun:latest"
+          name  = "diun"
+          args  = ["serve"]
+          env {
+            name  = "TZ"
+            value = "Europe/Sofia"
+          }
+          env {
+            name  = "DIUN_WATCH_WORKERS"
+            value = "20"
+          }
+          env {
+            name  = "DIUN_WATCH_SCHEDULE"
+            value = "0 */6 * * *"
+          }
+          env {
+            name  = "DIUN_WATCH_JITTER"
+            value = "30s"
+          }
+          env {
+            name  = "DIUN_PROVIDERS_KUBERNETES"
+            value = "true"
+          }
+          # env {
+          #   name  = "DIUN_DEFAULTS_EXCLUDETAGS"
+          #   value = "^.*nightly.*$"
+          # }
+          # env {
+          #   name  = "DIUN_DEFAULTS_INCLUDETAGS"
+          #   value = "^\\d+\\.\\d+\\.\\d+$"
+          # }
+          env {
+            name  = "DIUN_DEFAULTS_WATCHREPO"
+            value = "true"
+            # value = "false"
+          }
+          env {
+            name  = "DIUN_DEFAULTS_MAXTAGS"
+            value = "3"
+          }
+          env {
+            name  = "DIUN_DEFAULTS_SORTTAGS"
+            value = "reverse"
+          }
+          # DIUN_PROVIDERS_KUBERNETES_WATCHBYDEFAULT = "true" ??
+
+          // ntfy settings
+          # env { // disabled as if this fails, no other notifications are sent
+          #   name  = "DIUN_NOTIF_NTFY_ENDPOINT"
+          #   value = "https://ntfy.viktorbarzin.me"
+          # }
+          # env {
+          #   name  = "DIUN_NOTIF_NTFY_TOPIC"
+          #   value = "diun-updates"
+          # }
+          # env {
+          #   name  = "DIUN_NOTIF_NTFY_TOKEN"
+          #   value = var.diun_nfty_token
+          # }
+          env {
+            name  = "DIUN_NOTIF_SLACK_WEBHOOKURL"
+            value = var.diun_slack_url
+          }
+          env {
+            name = "LOG_LEVEL"
+            # value = "info"
+            value = "debug"
+          }
+          # env {
+          #   name  = "DIUN_WATCH_FIRSTCHECKNOTIF"
+          #   value = "true"  # send notfication on start; subsequent checks check for newer versions and is what you need
+          # }
+          # env {
+          #   name  = "DIUN_NOTIF_NTFY_TIMEOUT"
+          #   value = "10s"
+          # }
+          volume_mount {
+            name       = "data"
+            mount_path = "/data"
+          }
+        }
+        volume {
+          name = "data"
+          nfs {
+            path   = "/mnt/main/diun"
+            server = "10.0.10.15"
+          }
+        }
+      }
+    }
+  }
+}
+