七牛侧准备 WebP 兼容下载并保留色彩配置 #81
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Delete Branch "codex/qiniu-png-preparation-20261112"
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常见 WebP 上传图由七牛完成兼容 PNG 转换并持久保存,避免首次下载经过生产机往返;保留 ICC、原尺寸与透明度,并自动处理方向。七牛不支持的文件继续使用既有转换路径。
验证:回归与类型检查通过;真实上传图转换用时 2.14 秒,色彩配置与解码后的颜色逐像素一致。