[Feature] improve dubbo-admin by doubao's suggestion

**What would you like to be added**:

Using [Doubao](https://www.doubao.com/) to scan, analyze and correct some possible coding issues in the existing repository.

The issue names no files, tests, or entry points. First clarify which repository issues Doubao should detect, how findings should be corrected, where the integration should run, and what checks define a successful result.

Written by the indexing model from the issue text.