rebase main (#190)

* fix: align MOSProduct._build_system_prompt signature with MOSCore

- Fix TypeError when calling MOSProduct.chat() method
- MOSCore.chat() expects _build_system_prompt(memories, base_prompt=...)
- MOSProduct._build_system_prompt had incompatible signature (user_id, memories)
- Updated signature to match parent class interface
- Removed unused user_id parameter from method

* ran format

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Co-authored-by: chunyu li <[email protected]>
Co-authored-by: muzzlol <[email protected]>
Co-authored-by: CaralHsi <[email protected]>

Author: 4 people