[General] 自定义构建沙箱必须从源码安装吗

## Issue Type
- [ ] Question/Help needed
- [ ] Discussion
- [x] Documentation issue
- [ ] Installation problem
- [ ] Other: ___________

## Description
[Clearly describe your issue, question, or topic for discussion]

## Component (if applicable)
- [ ] Engine
- [x] Sandbox
- [ ] Tools
- [ ] Common
- [ ] Documentation
- [ ] Installation/Setup
- [ ] Not sure

## Environment (if relevant)
- **AgentScope Runtime Version:** [e.g. v1.0.3]
- **Python Version:** [e.g. 3.10]
- **OS:** [e.g. Ubuntu 20.04]

## Additional Context
[Any other relevant information, code snippets, or screenshots]

文档中提到自定义沙箱必须从源码安装，是这样吗？我没有看到必须从源码安装的原因。