# R2-05 — miot_cloud.go: set_redirect_url

## 缺失方法

Python `MIoTOauthClient.set_redirect_url`:

```python
def set_redirect_url(self, redirect_url: str) -> None:
    if not isinstance(redirect_url, str) or redirect_url.strip() == '':
        raise MIoTOauthError('invalid redirect_url')
    self._redirect_url = redirect_url
```

## 目标文件

`D:\miot\go-miot\miot_cloud.go`

在 `MIoTOauthClient` 上添加：
```go
func (c *MIoTOauthClient) SetRedirectURL(redirectURL string) error {
    if strings.TrimSpace(redirectURL) == "" {
        return NewMIoTOauthError("invalid redirect_url")
    }
    c.redirectURL = redirectURL
    return nil
}
```