是否能有更详细的 Demo 示例例如：同机房区域优先，灰度测试，流量隔离等

- [x] I have searched the [issues](https://github.com/apache/dubbo-admin/issues) of this repository and believe that this is not a duplicate.
- [x] I have checked the [REAMDE](https://github.com/apache/dubbo-admin/blob/develop/README.md) of this repository and believe that this is not a duplicate.

### Is your feature request related to a problem? Please describe.
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dubbo-admin 结合dubbo 应该能衍生出很多有意思，有趣，有用的玩法，例如：

- 灰度测试
- 流量隔离
- 同机房同区域优先

这些玩法在dubbo的[官网链接中](https://cn.dubbo.apache.org/zh/overview/tasks/traffic-management/zone/) 有一些体现，但是似乎这些demo的体现又不太完整，希望能有更详细的的解释文档，也许我也可以在已有的基础上，参与并贡献一些示例的demo

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Start by reviewing the repository README and the linked Dubbo traffic-management page, then compare their coverage of gray testing, traffic isolation, and same-zone priority. Done means adding more complete demo explanations for these scenarios in the appropriate documentation location, with enough detail for users to follow them.

Written by the indexing model from the issue text.