fix local provider bug

[callanwu]

PR Description
When the provider is set to local, the model name can be arbitrary. In such cases, litellm may enter the following code path:
https://github.com/BerriAI/litellm/blob/67b0c874a376a121f53f578e964992960757cfa5/litellm/litellm_core_utils/get_llm_provider_logic.py#L386-L393

This results in the following error:

LLM Provider NOT provided. Pass in the LLM provider you are trying to call. You passed model={model}
Pass model as E.g. For 'Huggingface' inference endpoints pass in 
completion(model='huggingface/starcoder',..)
Learn more: https://docs.litellm.ai/docs/providers

Fix
To handle this scenario, I updated the provider resolution logic to use:

      provider = (
          self.model_config.provider
          if self.model_config.provider != "local"
          else "hosted_vllm"
      )

This ensures that when provider="local", litellm correctly falls back to "hosted_vllm" and avoids the error.

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[Mortimerp9]

great! thank you for fixing this!

[callanwu]

@Mortimerp9 can you merge it?