fix: embedding service trigger timeout occasionally

[endxxxx]

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

embedding service trigger timeout occasionally

How to Reproduce | 如何重现

A large number of calls to the add_message interface were made in a short period of time, and the message content was quite long

Environment | 环境信息

Python version: 3.11
MemOS version: 2.0.3

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