config: add local port binding for PostgreSQL SSH access

- Add 127.0.0.1:5432:5432 port mapping to postgres service
- Allows Navicat SSH tunnel connection while maintaining security
- Only localhost can access the port, external access still blocked

docker-compose.yaml

@@ -60,6 +60,8 @@ services:
     volumes:
       - postgres_data:/var/lib/postgresql/data
       - ./ai-service/scripts/init_db.sql:/docker-entrypoint-initdb.d/init_db.sql:ro
+    ports:
+      - "127.0.0.1:5432:5432"
     networks:
       - ai-network
     healthcheck: