- Implement sanitization for `tool_choice` and removal of `disable_parallel_tool_use` in request payloads.
- Introduce logging for tool choice changes in `DoRequestHelper`.
- Update `ConvertRequest` to handle tool-call compatibility and maintain structured tool history.
- Add `ThoughtSignature` to `Part` struct for better tracking of reasoning content.
- Refactor request handling in `getRequestBody` to ensure strict compliance with OpenAI API requirements.
