fix: IPv6-safe virtual host port stripping via net.SplitHostPort#2206

Copilot wants to merge 2 commits intodev-vhostOpenListTeam/OpenList:dev-vhostfrom

copilot/sub-pr-2202-another-oneOpenListTeam/OpenList:copilot/sub-pr-2202-another-oneCopy head branch name to clipboard