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  "model": "gemini-3-pro-image-preview",
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    {
      "role": "user",
      "content": [
        {"type": "text", "text": "参考这张图的构图，画一只坐在窗边的猫"},
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          "type": "image_url",
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        "role": "assistant",
        "content": [
          {"type": "text", "text": "这是为你生成的图片："},
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              "url": "data:image/png;base64,AAAA..."
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