fix: conversation was still saved to the context after stop_event

[advent259141]

Motivation / 动机

修复了在 OnLLMResponseEvent 钩子中调用 stop_event() 后，本轮对话仍会被保存到上下文的问题。

之前的行为：当插件在 OnLLMResponseEvent 钩子中调用 event.stop_event() 时，虽然本次回复不会输出给用户，但对话历史（包括用户消息和 LLM 响应）仍然会被保存到会话上下文中，导致后续对话会包含这次被"停止"的对话内容。

期望行为：调用 stop_event() 后，本轮对话既不输出，也不保存到上下文。

Modifications / 改动点

核心文件修改：*

• astrbot/core/pipeline/process_stage/method/agent_sub_stages/internal.py

  • 在调用 _save_to_history() 前增加 event.is_stopped() 检查
  • 只有在事件未被停止时才保存对话历史到会话上下文

• 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.

Summary by Sourcery

错误修复：

• 当事件已被标记为停止时，跳过保存会话历史，确保已停止的回复既不会被输出，也不会存储在上下文中。

Original summary in English

Summary by Sourcery

Bug Fixes:

• Skip saving conversation history when an event has been marked as stopped, ensuring stopped responses are neither output nor stored in context.

[sourcery-ai]

你好——我已经审查了你的更改，一切看起来都很棒！

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Original comment in English

Hey - I've reviewed your changes and they look great!

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