{
  "model": "gemini-3.1-flash-image-preview",
  "prompt": "设计一张横版中文茶饮海报，标题「茶香入夏」，副标题「清爽一杯，刚刚好」，文字准确、布局清楚。",
  "size": "3840x2160",
  "n": 1
}