Add Docker development environment

Multistage Dockerfile (WooCommerce download, wp-bootstrap npm build,
Composer deps, WordPress runtime), Compose stack with MariaDB, and
auto-setup entrypoint that installs WordPress and activates the theme
on first boot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/setup.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+#
+# First-run setup: installs WordPress, activates WooCommerce and wc-bootstrap.
+#
+# Usage:
+#   docker compose exec wordpress setup.sh
+#
+set -euo pipefail
+
+WP_URL="${WP_URL:-http://localhost:8080}"
+WP_TITLE="${WP_TITLE:-WC Bootstrap Dev}"
+WP_ADMIN_USER="${WP_ADMIN_USER:-admin}"
+WP_ADMIN_PASSWORD="${WP_ADMIN_PASSWORD:-admin}"
+WP_ADMIN_EMAIL="${WP_ADMIN_EMAIL:-admin@example.com}"
+
+cd /var/www/html
+
+# Wait for WordPress files (entrypoint copies them on first boot)
+until [ -f wp-config.php ]; do
+    echo "Waiting for WordPress to initialize..."
+    sleep 2
+done
+
+if ! wp core is-installed --allow-root 2>/dev/null; then
+    echo "Installing WordPress..."
+    wp core install \
+        --url="$WP_URL" \
+        --title="$WP_TITLE" \
+        --admin_user="$WP_ADMIN_USER" \
+        --admin_password="$WP_ADMIN_PASSWORD" \
+        --admin_email="$WP_ADMIN_EMAIL" \
+        --skip-email \
+        --allow-root
+fi
+
+echo "Activating WooCommerce..."
+wp plugin activate woocommerce --allow-root 2>/dev/null || true
+
+echo "Activating wc-bootstrap theme..."
+wp theme activate wc-bootstrap --allow-root 2>/dev/null || true
+
+echo ""
+echo "Setup complete!"
+echo "  URL:      $WP_URL"
+echo "  Admin:    $WP_URL/wp-admin/"
+echo "  User:     $WP_ADMIN_USER"
+echo "  Password: $WP_ADMIN_PASSWORD"