fix: support cases when there is both field condition and logical operators

[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

Calling the get_memory interface with the mem_cube_id parameter and a filter carrying logical operators such as AND, OR, and NOT can result in call failure or continuous lag.

How to Reproduce | 如何重现

1. Calling get_memory interface
2. add mem_cube_id and filter with logical operators such as AND, OR and NOT.

Environment | 环境信息

MemOS version: v2.0.5
Python version: 3.11

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