Restoring a panel backup made by a newer pg_dump fails when the host's
pg_restore is older, and the existing pg_ensure_client only installs the
distribution package when the tools are missing - it can never upgrade,
and distribution repositories often cap below the required major.
Add pg_upgrade_client to x-ui.sh, exposed as 'x-ui pgclient [major]' and
as a PostgreSQL menu entry: it checks the installed pg_restore major,
tries the distribution package for the exact requested major first, and
falls back to the official PostgreSQL repository (apt on Debian/Ubuntu,
yum/dnf on Enterprise Linux, with a /usr/pgsql PATH symlink fallback);
Arch, Alpine and openSUSE install their current package. The panel's
dump-version mismatch error now names the ready-to-copy command with
the exact major parsed from the dump header.
pg_restore cannot read archives newer than itself, so importing a dump
made by pg_dump from PostgreSQL 17+ into a panel with an older
postgresql-client failed with a raw 'unsupported version (1.16) in file
header' - and only after Xray had already been stopped for the restore.
Probe the uploaded file with pg_restore --list first, which reads only
the archive TOC without touching the database, so an unreadable dump is
rejected before Xray is interrupted. When the failure is a dump-format
version mismatch, translate it into a message naming the PostgreSQL
version that produced the dump and the client version to install.
MHSanaei