feat(deploy): add production Dockerfiles and CI/CD pipeline

- Multi-stage Dockerfile for apps/api (NestJS) and apps/web (Next.js standalone)
- Production docker-compose.prod.yml with all services, health checks, and security
- Real deploy.yml pipeline: build → push to GHCR → deploy staging/production
- .dockerignore for optimized build context
- Enable Next.js standalone output mode

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/next.config.js

@@ -1,6 +1,7 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   reactStrictMode: true,
+  output: 'standalone',
 };
 
 module.exports = nextConfig;