fix(openai): handle usage object without mutation

[hassiebp]

Important

Fixes mutation issue in _parse_usage by copying the usage dictionary in openai.py.

• Behavior:
  • Modify _parse_usage in openai.py to copy the usage dictionary to prevent mutation of the original object.
  • Ensure compatibility with both dictionary and object-based usage inputs.
• Tests:
  • Update assertions in test_openai.py to check for substring presence in model names.

^{This description was created by for 979ce0b. It will automatically update as commits are pushed.}

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Greptile Summary

Disclaimer: Experimental PR review

This PR modifies the OpenAI usage object handling in langfuse-python to prevent unintended mutations of the original usage data during token detail processing.

• Modified _parse_usage in langfuse/openai.py to create a copy of the usage dictionary before processing
• Ensures data integrity by preventing modifications to the original OpenAI usage object
• Maintains compatibility with both dictionary and object-based usage inputs

[greptile-apps]

LGTM

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