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IFLiteLLM 1.82.0 complexity router fails with a Pydantic validation error when clients send message content as a list of parts (e.g., `[{'type':'text','text':'...'}]`) because the type annotation for `PreRoutingHookResponse.messages` is too strict.

THENPatch `litellm/types/router.py`: change `PreRoutingHookResponse.messages` from `List[Dict[str, str]]` to `List[Dict[str, Any]]` and add `Any` to the typing imports.

IFlangfuse's UpdateGenerationBody raises validation errors when usage details contain empty objects or None for integer fields like completion_tokens_details and prompt_tokens_details.

THENBefore passing usage data to langfuse's update method, ensure that nested fields under usageDetails (e.g., completion_tokens_details, prompt_tokens_details) are provided as complete objects with all integer fields set to 0 if empty. For example, if the OpenAI response returns empty `{}` for these details, replace them with a dict containing all expected keys set to 0. Alternatively, check pydantic version compatibility and update the model schema if needed.