fix: 将 field 替换为 Field 以符合 Pydantic 模型定义规范

[miaoxutao123]

Summary by Sourcery

文档：

• 在 AI 工具指南中，将 Pydantic 模型示例中 parameters 属性使用的 field 更正为 Field。

Original summary in English

Summary by Sourcery

Documentation:

• Correct the Pydantic model examples in the AI tools guide to use Field instead of field for the parameters attribute.

[sourcery-ai]

你好，我已经查看了你的修改——这里有一些反馈：

• 既然示例现在使用 Field 而不是 field，请确保周围的代码片段（或者指南中更早的一个片段）明确从 Pydantic 中导入 Field，这样读者在运行示例时不会感到困惑。

给 AI 代理的提示

Please address the comments from this code review:

## Overall Comments
- Since the examples now use `Field` instead of `field`, ensure the surrounding code snippet (or an earlier snippet in the guide) explicitly imports `Field` from Pydantic so readers can run the example without confusion.

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Original comment in English

Hey there - I've reviewed your changes - here's some feedback:

• Since the examples now use Field instead of field, ensure the surrounding code snippet (or an earlier snippet in the guide) explicitly imports Field from Pydantic so readers can run the example without confusion.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since the examples now use `Field` instead of `field`, ensure the surrounding code snippet (or an earlier snippet in the guide) explicitly imports `Field` from Pydantic so readers can run the example without confusion.

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