[WIP]adapt for openclaw: add memory output language pipeline

[Mijamind719]

Description

对接openclaw记忆入库语言增加prompt约束，和用户语言保持一致.
原代码逻辑中记忆库中的语言无明确约束，可能出现和用户语言不一致的情况，导致查询召回的相关性较低。
增加输出语言约束：

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes

[CLAassistant]

All committers have signed the CLA.