Add Docker deploy config for VPS (node-server + Traefik)

- Dockerfile: bun build with Nitro node-server preset -> standalone Node runner
- docker-compose.yml: Traefik labels for automatic HTTPS, runtime env from .env
- .dockerignore + DEPLOY.md (Hostinger VPS: Docker + Dockge + Traefik steps)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,11 @@
+.git
+node_modules
+.output
+.nitro
+.tanstack
+.wrangler
+dist
+dist-ssr
+*.log
+Dockerfile
+.dockerignore