serveUploadedFile(ctx: Context,filePath: string,mime: string,cacheMaxAge?: number,isPrivate?: boolean,defaultWidth?: ImageWidth): Promise<boolean>
Serves an uploaded image inline as mime, or scaled down as
serveImage does, cached for cacheMaxAge seconds, and only by the
browser when isPrivate. It answers 404 and resolves false when the file
is missing. The caller checks first that the viewer may see it.
optional
defaultWidth: ImageWidth