mc keeps one --resolve IP per host, and Coolify always pinned the IPv4
address of a dual-stack endpoint. On servers without IPv4, uploads failed
with "network is unreachable". A helper container on the upload network
now connects to each validated IP, IPv4 first, and the first IP that
connects is pinned. S3 restores are now pinned in the same way.
Closes#12397
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
