fix: summarizer 模型没有进行“总结”，而是进行“对话”。换了许多个模型仍然一样

[lufercy-cell]

Pre-submission checklist | 提交前检查

• I have searched existing issues and this hasn't been mentioned before | 我已搜索现有问题，确认此问题尚未被提及
• I have read the project documentation and confirmed this issue doesn't already exist | 我已阅读项目文档并确认此问题尚未存在
• This issue is specific to MemOS and not a general software issue | 该问题是针对 MemOS 的，而不是一般软件问题

Bug Description | 问题描述

对话内容的“摘要”并不是总结，而是对用户那句话的回答。实质上是在进行“对话”而不是“总结”

先后试过的LLM：GLM 4.7，ollma 本地模型：phi4-mini:latest ; qwen2.5:7b; qwen2.5:1.5b

其中qwen2.5:1.5b 正常过一阵子，但后来经常提示 time out，尝试换了其他模型，结果又变成了“对话”。最后换回qwen2.5:1.5b 后，仍然是“对话”而非“总结”

How to Reproduce | 如何重现

1. 与大模型发送信息
2. 到 Memos UI 中，在“记忆”中刷新
3. 查看对话……

Environment | 环境信息

Macos 15.5
Memos version: 1.0.1

Additional Context | 其他信息

No response

Willingness to Implement | 实现意愿

• I'm willing to implement this myself | 我愿意自己解决
• I would like someone else to implement this | 我希望其他人来解决

[github-actions]

This issue has been automatically marked as stale due to inactivity.

[MaiHHConnect]

💬 我也在做记忆系统相关的工作：CausaMem，可以来看看，说不定有能借鉴的地方 🙂

[github-actions]

This issue has been automatically marked as stale due to inactivity.