Add Drupal headless stack with Next.js frontend

- Add Next.js frontend service (nextjs) with Dockerfile and source
- Update docker-compose.yml: image names, Drupal 11.3.3, nextjs service
- Add docker-compose.override.yml.disabled for dev hot-reload
- Add install-headless-modules.sh for OAuth/JSON:API module setup
- Add README.md with full setup and configuration guide
- Update nginx/Dockerfile and nginx.conf.template for cms. subdomain
- Update drupal/Dockerfile PHP-FPM build args
- Gitignore **/.vscode/ to prevent IDE workspace files from being tracked

drupal/nextjs/components/node-article-teaser.tsx

@@ -0,0 +1,34 @@
+import type { DrupalNode } from "@/lib/types"
+
+interface NodeArticleTeaserProps {
+  node: DrupalNode
+}
+
+export function NodeArticleTeaser({ node }: NodeArticleTeaserProps) {
+  const href = node.path?.alias || `/node/${node.id}`
+
+  return (
+    <article className="group rounded-lg border border-gray-200 bg-white p-6 shadow-sm transition hover:shadow-md">
+      <h3 className="mb-2 text-xl font-semibold">
+        <a href={href} className="text-gray-900 group-hover:text-emerald-500">
+          {node.title}
+        </a>
+      </h3>
+      <div className="mb-3 flex items-center gap-3 text-sm text-gray-500">
+        {node.uid?.display_name && (
+          <span>By {node.uid.display_name}</span>
+        )}
+        <time dateTime={node.created}>
+          {new Date(node.created).toLocaleDateString("en-US", {
+            year: "numeric",
+            month: "long",
+            day: "numeric",
+          })}
+        </time>
+      </div>
+      {node.body?.summary && (
+        <p className="line-clamp-3 text-gray-600">{node.body.summary}</p>
+      )}
+    </article>
+  )
+}