ImageGenerateVO

{
    "model": "nano-banana",
    "prompt": "帮我把图片的背景替换成竹林：https://example.com/image.png",
    "aspectRatio": "1:1",
    "responseFormat": "url",
    "imageUrls": [
        "https://example.com/image1.jpg",
        "https://example.com/image2.jpg"
    ]
}