[Bug]: Doubao blocked the request with a verification challenge

### Description

doubao网页版可以正常使用，但opencli提示：
ok: false
error:
code: COMMAND_EXEC
message: Doubao blocked the request with a verification challenge
help: 'Detected challenge signal: iframe[src*="captcha"]'
exitCode: 1

### Steps to Reproduce

opencli doubao ask "xxx" --timeout 90

### Expected Behavior

正常返回结果

### OpenCLI Version

1.8.3

### Node.js Version

Other

### Operating System

macOS

### Logs / Screenshots

```shell
opencli doubao ask "今天天气怎么样？" --timeout 90 -v
ok: false
error:
code: COMMAND_EXEC
message: Doubao blocked the request with a verification challenge
help: 'Detected challenge signal: iframe[src*="captcha"]'
exitCode: 1
stack: |-
CommandExecutionError: Doubao blocked the request with a verification challenge
at sendDoubaoMessage (file:///Users/xxx/.nvm/versions/node/v24.14.1/lib/node_modules/@jackwener/opencli/clis/doubao/utils.js:712:15)
at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
at async Object.func (file:///Users/xxx/.nvm/versions/node/v24.14.1/lib/node_modules/@jackwener/opencli/clis/doubao/ask.js:27:9)
```

Start with clis/doubao/utils.js around sendDoubaoMessage at the reported failure point, then inspect clis/doubao/ask.js and reproduce with `opencli doubao ask "今天天气怎么样？" --timeout 90 -v`. Determine how the reported captcha iframe challenge is handled; done means the command returns the expected result when the Doubao webpage is otherwise usable.

Written by the indexing model from the issue text.