[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/dashy/module/main.tf

@@ -0,0 +1,126 @@
+
+variable "tls_secret_name" {}
+variable "tier" { type = string }
+
+module "tls_secret" {
+  source          = "../../../modules/kubernetes/setup_tls_secret"
+  namespace       = kubernetes_namespace.dashy.metadata[0].name
+  tls_secret_name = var.tls_secret_name
+}
+
+resource "kubernetes_namespace" "dashy" {
+  metadata {
+    name = "dashy"
+    labels = {
+      "istio-injection" : "disabled"
+      tier = var.tier
+    }
+  }
+}
+
+resource "kubernetes_config_map" "config" {
+  metadata {
+    name      = "config"
+    namespace = kubernetes_namespace.dashy.metadata[0].name
+
+    annotations = {
+      "reloader.stakater.com/match" = "true"
+    }
+  }
+
+  data = {
+    "conf.yml" = file("${path.module}/conf.yml")
+  }
+}
+
+resource "kubernetes_deployment" "dashy" {
+  metadata {
+    name      = "dashy"
+    namespace = kubernetes_namespace.dashy.metadata[0].name
+    labels = {
+      app  = "dashy"
+      tier = var.tier
+    }
+    annotations = {
+      "reloader.stakater.com/search" = "true"
+    }
+  }
+  spec {
+    replicas = 1
+    selector {
+      match_labels = {
+        app = "dashy"
+      }
+    }
+    template {
+      metadata {
+        annotations = {
+          # "diun.enable" = "true"
+        }
+        labels = {
+          app = "dashy"
+        }
+      }
+      spec {
+        container {
+          image = "lissy93/dashy:latest"
+          name  = "dashy"
+
+          resources {
+            requests = {
+              cpu    = "50m"
+              memory = "256Mi"
+            }
+            limits = {
+              cpu    = "1"
+              memory = "2Gi"
+            }
+          }
+          port {
+            container_port = 8080
+          }
+          volume_mount {
+            name       = "config"
+            mount_path = "/app/user-data/"
+          }
+        }
+        volume {
+          name = "config"
+          config_map {
+            name = "config"
+          }
+        }
+      }
+    }
+  }
+}
+
+resource "kubernetes_service" "dashy" {
+  metadata {
+    name      = "dashy"
+    namespace = kubernetes_namespace.dashy.metadata[0].name
+    labels = {
+      app = "dashy"
+    }
+  }
+
+  spec {
+    selector = {
+      app = "dashy"
+    }
+    port {
+      name        = "http"
+      port        = 80
+      target_port = 8080
+    }
+  }
+}
+
+module "ingress" {
+  source          = "../../../modules/kubernetes/ingress_factory"
+  namespace       = kubernetes_namespace.dashy.metadata[0].name
+  name            = "dashy"
+  tls_secret_name = var.tls_secret_name
+  protected       = true # hidden as we use homepage now
+}
+