Fix cached_tokens handling in _extract_usage method

[LIghtJUNction]

Ensure cached_tokens is an integer and handle None safely.

Modifications / 改动点

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Bug Fixes:

• Prevent cached token accounting from misbehaving when prompt token details omit or nullify cached_tokens.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the robustness of token usage calculation within the OpenAI source provider. It specifically addresses potential issues where cached_tokens might not be an integer or prompt_tokens might not be safely handled, preventing errors and ensuring accurate reporting of token consumption.

Highlights

• Robust Token Usage Extraction: The _extract_usage method in openai_source.py was updated to ensure cached_tokens is an integer, defaulting to 0 if its type is not int, and to explicitly note the safe handling of prompt_tokens.

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[gemini-code-assist]

Code Review

The pull request enhances the robustness of the _extract_usage function in openai_source.py by adding an explicit type check for the cached token count. This ensures that cached is always an integer, converting it to 0 if it's not, to prevent potential type errors when performing arithmetic operations, particularly if ptd.cached_tokens could resolve to None.