fix: update web_search_tavily handling for webchat platform

[Soulter]

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

• 😊 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。/ If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
• 👀 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”。/ My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
• 🤓 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了 requirements.txt 和 pyproject.toml 文件相应位置。/ 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.
• 😮 我的更改没有引入恶意代码。/ My changes do not introduce malicious code.

由 Sourcery 提供的摘要

错误修复：

• 确保仅当传入事件来源于 webchat 平台时，才在 tool-end 钩子中对 web_search_tavily 的结果进行后处理。

Original summary in English

Summary by Sourcery

Bug Fixes:

• Ensure web_search_tavily results are only post-processed in the tool-end hook when the incoming event originates from the webchat platform.

[sourcery-ai]

Hey - 我在这里给出一些整体性的反馈：

• 建议对 run_context.context.event.get_platform_name() 做空值保护，以防 context 或 event 可能为 None，从而避免在其他平台或未来重构中出现潜在的属性错误。
• 建议为平台字符串字面量 "webchat"（以及其他平台检查中共享使用的值）使用常量或枚举，这样可以让这个条件判断更不易出错，也更方便未来扩展到其他平台。

供 AI Agent 使用的提示词

Please address the comments from this code review:

## Overall Comments
- Consider guarding `run_context.context.event.get_platform_name()` in case `context` or `event` is ever `None`, to avoid potential attribute errors in other platforms or future refactors.
- Using a constant or enum for the literal platform string `"webchat"` (shared with other platform checks) would make this condition less error-prone and easier to extend to additional platforms later.

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Original comment in English

Hey - I've left some high level feedback:

• Consider guarding run_context.context.event.get_platform_name() in case context or event is ever None, to avoid potential attribute errors in other platforms or future refactors.
• Using a constant or enum for the literal platform string "webchat" (shared with other platform checks) would make this condition less error-prone and easier to extend to additional platforms later.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider guarding `run_context.context.event.get_platform_name()` in case `context` or `event` is ever `None`, to avoid potential attribute errors in other platforms or future refactors.
- Using a constant or enum for the literal platform string `"webchat"` (shared with other platform checks) would make this condition less error-prone and easier to extend to additional platforms later.

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