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Enhance OpenAI provider and update fixtures

- Improved response handling in `lib/req_llm/response.ex` and `lib/req_llm/providers/openai.ex` to ensure better compatibility with OpenAI's API.
- Added new test cases for structured output in `test/provider/openai_structured_output_test.exs` to validate the updated response structures.
- Updated various fixture files for OpenAI and Google models to reflect recent changes in API responses and ensure accurate testing.
- Removed deprecated files related to the OpenAI o3 deep research model to streamline the codebase.