Gemini 3.1 Flash Image

创建 API 密钥，并在终端中将其设为 SAYGM_API_KEY。 图像以 base64 编码的形式在响应中返回。

curl "https://api.saygm.com/v1beta/models/gemini-3.1-flash-image:generateContent" \
  -H "Authorization: Bearer $SAYGM_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "contents": [
    {
      "role": "user",
      "parts": [
        {
          "text": "A paper boat drifting across a quiet pond at sunrise."
        }
      ]
    }
  ],
  "generationConfig": {
    "responseModalities": [
      "TEXT",
      "IMAGE"
    ],
    "imageConfig": {
      "aspectRatio": "16:9"
    }
  }
}'