refactor: 注释掉配置文件挂载，默认不挂载

Author: lyingbug

docker-compose.yml

@@ -22,7 +22,8 @@ services:
       - "${APP_PORT:-8080}:8080"
     volumes:
       - data-files:/data/files
-      - ./config/config.yaml:/app/config/config.yaml
+      # Optional: mount custom config file
+      # - ./config/config.yaml:/app/config/config.yaml
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
       interval: 30s