fix: bind app port to 0.0.0.0 so it's reachable from the network

127.0.0.1:3000 only accepted connections from localhost.
DB port intentionally stays on 127.0.0.1.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -18,7 +18,7 @@ services:
   app:
     build: .
     ports:
-      - "127.0.0.1:3000:3000"
+      - "0.0.0.0:3000:3000"
     environment:
       DATABASE_URL: postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}
       NEXTAUTH_SECRET: ${NEXTAUTH_SECRET}