部署目录结构

one agent和插件本身都支持多版本，版本号用`@`来分隔：

```
├── oneagent@0.0.1
├── oneagent@0.0.2
└── plugins
├── arthas@3.3.7
├── arthas@3.3.9
├── sample-agent@0.0.1
└── sample-agent@0.0.2
```

TODO： 是否要有元数据来保存加载了哪些插件的哪些版本？

The issue names no files, tests, or entry points. Review the deployment and plugin-loading implementation to decide how versioned directories are discovered and whether metadata must record loaded plugin versions; done means the directory and metadata behavior are explicitly decided and documented.

Written by the indexing model from the issue text.