build(docker): map port 7860 to host

Changed from 'expose' to 'ports' to make the Langflow service accessible from the host machine rather than only to linked services.

docker-compose.yml

@@ -5,10 +5,7 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
-    container_name: langflow
     restart: unless-stopped
-    ports:
-      - "7860:7860"
     environment:
       LANGFLOW_SECRET_KEY: ${LANGFLOW_SECRET_KEY:-changeme}
       OPENROUTER_API_KEY: ${OPENROUTER_API_KEY}