When completing a multipart upload, the code was listing parts with limit=0,
which relies on the server's DirListingLimit default. In 'weed server' mode,
this defaults to 1000, causing uploads with more than 1000 parts to fail
with InvalidPart error.
For a 38GB file with 8MB parts (AWS CLI default), this results in ~4564 parts,
far exceeding the 1000 limit.
Fix: Use explicit limit of MaxS3MultipartParts+1 (10001) to ensure all parts
are listed regardless of server configuration.
Fixes#7638
9c266fac29