Fix inline images to use data URI format instead of raw base64

[Copilot]

Inline images were being sent as raw base64 to the OpenAI API, which expects a data URI (data:image/png;base64,...) for the image_url.url field. This caused 400 errors as the API attempted to download the base64 string as a URL.

Changes

• Use $file->getDataUri() instead of $file->getBase64Data() for inline images in AbstractOpenAiCompatibleTextGenerationModel::getMessagePartContentData()
• Update test expectation to match correct data URI format

Note: Audio inputs correctly continue using getBase64Data() since that API expects raw base64 with a separate format field.

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Inline images sent as raw base64 instead of data URI</issue_title>
<issue_description>## Summary

In AbstractOpenAiCompatibleTextGenerationModel, inline images are sent using $file->getBase64Data() which returns raw base64. The OpenAI API's image_url.url field expects a data URI (data:image/png;base64,...).

Fix

Use $file->getDataUri() instead of $file->getBase64Data() when building the image_url payload.

Error

Bad Request (400) - Failed to download image from iVBORw0KGgoAAAANSUhEUg...
Image URL is invalid.

The API interprets raw base64 as a URL and tries to download it.

Note

getBase64Data() is correct for the audio input API which expects raw base64 with a separate format field. It's only wrong for images where the URL field needs the full data URI.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Inline images sent as raw base64 instead of data URI #137

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