[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/plotting-book/module/main.tf

@@ -0,0 +1,100 @@
+variable "tls_secret_name" {}
+variable "tier" { type = string }
+
+resource "kubernetes_namespace" "plotting-book" {
+  metadata {
+    name = "plotting-book"
+    labels = {
+      "istio-injection" : "disabled"
+      tier = var.tier
+    }
+  }
+}
+
+module "tls_secret" {
+  source          = "../../../modules/kubernetes/setup_tls_secret"
+  namespace       = kubernetes_namespace.plotting-book.metadata[0].name
+  tls_secret_name = var.tls_secret_name
+}
+
+resource "kubernetes_deployment" "plotting-book" {
+  metadata {
+    name      = "plotting-book"
+    namespace = kubernetes_namespace.plotting-book.metadata[0].name
+    labels = {
+      app  = "plotting-book"
+      tier = var.tier
+    }
+  }
+  lifecycle {
+    ignore_changes = [
+      spec[0].template[0].spec[0].container[0].image,
+    ]
+  }
+  spec {
+    replicas = 1
+    selector {
+      match_labels = {
+        app = "plotting-book"
+      }
+    }
+    template {
+      metadata {
+        labels = {
+          app = "plotting-book"
+        }
+      }
+      spec {
+        container {
+          image = "ancamilea/book-plotter:latest"
+          # image = "viktorbarzin/book-plotter:7"
+          name              = "plotting-book"
+          image_pull_policy = "Always"
+          port {
+            container_port = 3001
+          }
+          resources {
+            requests = {
+              memory = "128Mi"
+              cpu    = "50m"
+            }
+            limits = {
+              memory = "512Mi"
+              cpu    = "500m"
+            }
+          }
+        }
+      }
+    }
+  }
+}
+
+resource "kubernetes_service" "plotting-book" {
+  metadata {
+    name      = "plotting-book"
+    namespace = kubernetes_namespace.plotting-book.metadata[0].name
+    labels = {
+      "app" = "plotting-book"
+    }
+  }
+
+  spec {
+    selector = {
+      app = "plotting-book"
+    }
+    port {
+      name        = "http"
+      port        = 80
+      target_port = 3001
+    }
+  }
+}
+
+module "ingress" {
+  source          = "../../../modules/kubernetes/ingress_factory"
+  namespace       = kubernetes_namespace.plotting-book.metadata[0].name
+  name            = "plotting-book"
+  tls_secret_name = var.tls_secret_name
+
+  custom_content_security_policy = "default-src 'self' blob: data:; img-src 'self' data: blob:; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval' blob:; worker-src 'self' blob:; connect-src 'self' blob:; frame-ancestors 'self' *.viktorbarzin.me viktorbarzin.me"
+}