色图获取，当用户说'色图'、'涩图'、'每日色图'、'来点色图'、'setu'等指令时，AI会提供一张随机的色图（通常是动漫风格的图片）。
当用户输入以下任一指令或者有相关意图时激活色图获取功能：
该 API 直接返回图片二进制数据，URL 本身就是图片链接。
重要：必须使用随机参数来防止缓存！
每次请求时生成一个唯一的时间戳，拼接到 URL 中：
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