[BUG] shenyu-examples-mcp can't find healthy upstream

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Current Behavior

now it will return error that can't find healthy upstream if you call the api in shenyu-examples-mcp by mcp client

### Expected Behavior

_No response_

### Steps To Reproduce

_No response_

### Environment

```markdown
ShenYu version(s):latest
```

### Debug logs

_No response_

### Anything else?

i will fix it

No file, test, entry point, reproduction steps, or debug log is provided. Start by reproducing an API call in shenyu-examples-mcp with an MCP client and trace the healthy-upstream error; done means the call succeeds without that error.

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