Fix Ollama API compatibility for newer versions

[Samay10]

Fixes #413

Description

Ollama API changed response structure in newer versions, moving generated content from response to thinking. This update adds backward compatibility by reading response first and falling back to thinking when response is empty.

• Handle both old (response) and new (thinking) Ollama API response formats
• Added a regression test for the new thinking response case
• Updated Ollama response documentation to reflect the API change

How Has This Been Tested?

• Added a new regression test for Ollama responses returning output in thinking
• Ran pytest tests/inference_test.py::TestOllamaLanguageModel
• Verified ./autoformat.sh and pre-commit formatting checks

Checklist

• My code follows the style guidelines
• I have self-reviewed my own code
• I have commented my code where necessary
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests passed locally with my changes

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[github-actions]

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