自己创建的插件如何调用

本地部署的平台：
1、是否只能支持自己使用？
2、除了作为工作流中的一个插件供调用，是否可以单独作为一个插件服务被使用类似api方法调用？
3、本地部署是不能把插件上架到商店的是吧

The issue names no file, test, or entry point. Start by reviewing the local-deployment and plugin-invocation entry points, then determine whether standalone API use and store publishing are supported; done means the three usage questions have documented, verified answers or a clearly scoped implementation plan.

Written by the indexing model from the issue text.