1. test_bedrock_converse_budget_tokens_preserved:
- Fixed mocking at the correct level (litellm.acompletion instead of client.post)
- The previous mock didn't work because the code runs through run_in_executor
and the passed client parameter was not being used
2. test_error_class_returns_volcengine_error:
- Changed isinstance check to class name comparison
- This avoids issues when module reloading (in conftest.py) causes class
identity mismatches during parallel test execution
* Add Volcengine responses adapter
* fix llms/volcengine/responses/transformation.py:507:9: F841 Local variable `origin` is assigned to but never used
fix llms/volcengine/responses/transformation.py:95: error: Argument "headers" to "VolcEngineError" has incompatible type
add more supported optional params
removed redundant manual logging/utils fallbacks so litellm/__init__.py uses the registry only.
