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/install-headless-modules.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+set -e
+
+echo "Installing Headless Drupal modules..."
+
+# Check if aliases are available.
+if command -v dcomposer &> /dev/null; then
+    COMPOSER_CMD="dcomposer"
+    DRUSH_CMD="ddrush"
+else
+    COMPOSER_CMD="docker exec drupal-fpm composer"
+    DRUSH_CMD="docker exec drupal-fpm drush"
+fi
+
+# Core headless modules.
+echo "→ Installing core headless modules..."
+$COMPOSER_CMD require \
+    drupal/next \
+    drupal/jsonapi_extras \
+    drupal/simple_oauth \
+    drupal/pathauto \
+
+# Additional JSON:API enhancements.
+echo "→ Installing JSON:API enhancement modules..."
+$COMPOSER_CMD require \
+    drupal/subrequests \
+    drupal/decoupled_router \
+    drupal/consumers \
+    drupal/jsonapi_menu_items \
+    drupal/jsonapi_include \
+    drupal/jsonapi_resources \
+    drupal/jsonapi_menu_items
+
+# Content and media.
+echo "→ Installing content and media modules..."
+$COMPOSER_CMD require \
+    drupal/metatag \
+    drupal/redirect \
+    drupal/field_group
+
+# Performance and caching.
+echo "→ Installing performance modules..."
+$COMPOSER_CMD require \
+    drupal/redis
+
+# Development tools.
+echo "→ Installing development tools..."
+$COMPOSER_CMD require --dev \
+    drupal/coder \
+    drupal/devel \
+    drupal/restui \
+    drupal/admin_toolbar
+
+# "Advanced" modules.
+echo "→ Installing advanced modules..."
+$COMPOSER_CMD require \
+    drupal/pathauto
+
+echo "✓ All modules installed successfully!"
+echo ""
+echo "Next steps:"
+echo "1. Enable modules: $DRUSH_CMD en next jsonapi_extras simple_oauth pathauto -y"
+echo "2. Generate OAuth keys: docker exec drupal-fpm bash -c 'cd /opt/drupal && mkdir -p oauth/keys && openssl genrsa -out oauth/keys/private.key 2048 && openssl rsa -in oauth/keys/private.key -pubout -out oauth/keys/public.key && chmod 600 oauth/keys/*.key'"
+echo "3. Configure modules via Drupal admin UI"
+echo "4. Export configuration: $DRUSH_CMD cex -y"