feat: migrate containers to FrankenPHP + Laravel Octane

[Romerolweb]

What changes I've made

• Replaced serversideup/php (PHP-FPM + nginx) base images with dunglas/frankenphp:php8.3-alpine
  in Dockerfile.all-in-one, backend/Dockerfile, and backend/Dockerfile.dev
• Added laravel/octane dependency and published config/octane.php configured for FrankenPHP
  worker mode
• Replaced docker/all-in-one/nginx/nginx.conf with a Caddyfile — FrankenPHP embeds Caddy so
  a separate nginx process is no longer needed
• Replaced the old supervisor/supervisord.conf (nginx + PHP-FPM entries) with a new
  supervisord.conf that starts the Octane worker and the Laravel queue worker
• Fixed the /api route prefix in RouteServiceProvider — Laravel Octane strips the prefix
  applied at the Route::middleware('api') group level; adding ->prefix('api') explicitly
  restores correct routing
• Added build-time VITE_* ARGs to Dockerfile.all-in-one so the frontend bundle can be
  configured at image build time (needed for custom deployments where the API URL differs from
  the default)
• Removed the standalone nginx sidecar from docker-compose.dev.yml — FrankenPHP serves HTTP
  directly, making the extra reverse-proxy container unnecessary
• Updated docker/all-in-one/docker-compose.yml: port 8123:80 → 8000:8000, added
  OCTANE_SERVER=frankenphp, APP_ENV/APP_DEBUG defaults, and QUEUE_CONNECTION default
• Updated docker/all-in-one/README.md quick-start URL to the new port

Why I've made these changes

FrankenPHP with Laravel Octane keeps the Laravel application bootstrapped in memory between
requests, eliminating per-request boot overhead. This meaningfully improves throughput for
event/ticket operations. FrankenPHP also embeds Caddy, which simplifies the all-in-one container
by removing the nginx process and its associated configuration.

How I've tested these changes

• Built the all-in-one Docker image locally on Apple Silicon (ARM64)
• Built the standalone backend/Dockerfile on ARM64 and verified it starts correctly
• Tested end-to-end flows: user registration, login, event creation, ticket checkout, and webhook
  delivery
• Ran the existing PHPUnit test suite — all tests pass

Checklist

• I have read the contributing guidelines.
• My code follows the coding standards of the project.
• I have tested my changes, and they work as expected.
• I understand that this PR will be closed if I do not follow the contributor guidelines and if this PR template is left unedited.

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[Romerolweb]

I have read the CLA Document and I hereby sign the CLA