Response format for OpenAiAudioTranscriptionOptions is ignored

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Bug description
Response format for OpenAiAudioTranscriptionOptions is being ignored. For example, using VERBOSE_JSON and GranularityType.WORD will return simple text response.

Environment
Using spring-ai version 1.0.0-SNAPSHOT
Java version 21

Steps to reproduce
AudioTranscriptionOptions options = OpenAiAudioTranscriptionOptions.builder()
.responseFormat(TranscriptResponseFormat.VERBOSE_JSON)
.granularityType(GranularityType.WORD)
.build();

  AudioTranscriptionPrompt transcriptionRequest = new AudioTranscriptionPrompt(audioResource, options);
  AudioTranscriptionResponse response = openAiAudioTranscriptionModel.call(transcriptionRequest);

Inspect the response

Expected behavior
Response should respect the granularity and response format options.

Minimal Complete Reproducible example
Please provide a failing test or a minimal complete verifiable example that reproduces the issue.
Bug reports that are reproducible will take priority in resolution over reports that are not reproducible.

Start at OpenAiAudioTranscriptionOptions and the audio transcription model call shown in the reproduction, then trace how responseFormat and granularityType reach the request. Reproduce the example with spring-ai 1.0.0-SNAPSHOT and Java 21; done means VERBOSE_JSON and WORD granularity are reflected in the response.