Scans the input directory for .dvc pointer files and downloads each
corresponding data file from the public Cloudflare R2 remote,
preserving the subdirectory structure.
No credentials are required since the remote is publicly accessible.
Examples
if (FALSE) { # \dontrun{
input_dir <- system.file("extdata/dvc-example", package = "nemo")
output_dir <- file.path(tempdir(), "dvc_dl_test")
result <- dvc_download_all(input_dir, output_dir)
result_cached <- dvc_download_all(input_dir, output_dir)
} # }
