[Epic-Drytu]

Summary

• Add the metadata-file protection rule from the official Nextcloud Nginx configuration to all four FPM Docker Compose examples.
• Return HTTP 404 for direct requests to composer.json, composer.lock, package.json, package-lock.json, and core/shipped.json.
• Preserve the existing Docker-specific resolver, PHP-FPM upstream, and reverse-proxy configuration.

Validation

• All four Nginx configurations passed nginx -t using nginx:alpine-slim.
• git diff --check passed.
• HTTP runtime behavior has not been integration-tested.

Closes #2606

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI (N/A)