Tighten Docker build and dependency audit

docker-compose.local.yml

@@ -20,10 +20,6 @@ services:
       - SMTP_PASS=${SMTP_PASS}
       - MAIL_FROM=${MAIL_FROM}
       - SMTP_DEBUG=${SMTP_DEBUG:-false}
-    volumes:
-      - ./dist:/app/dist # Map local build to container
-      - ./backend/index.js:/app/index.js
-      - ./backend/db.js:/app/db.js
     command: ["node", "index.js"]
     depends_on:
       - db