fix(model): DashScope provider error

[hazeone]

📝 Pull Request Template

1. Related Issue

2. Type of Change (select one)

Type of Change: Bug Fix

3. Description

Resolve minor chore problems in PR #441

4. Testing

• I have tested this locally.
• I have updated or added relevant tests.

5. Checklist

• I have read the Code of Conduct
• I have followed the Contributing Guidelines
• My changes follow the project's coding style

[hazeone]

@byronwang2005 You can review this PR; it doesn't require significant changes.

[byronwang2005]

Yes, it was originally just a minor glitch—but I just realized this calling method still isn’t native DashScope; it’s still OpenAI-compatible.

[byronwang2005]

But even this modification isn’t truly native—see link: DashScope doesn’t require a base_url