Add a forced container env (_ct_env) exporting LC_ALL/LANG=C.UTF-8 and DEBIAN_FRONTEND to ensure commands (apt, sed, locale-gen, getent, tz setup) run reliably in fresh templates that lack generated locales. Use the env when running pct exec for locale setup, timezone symlink, DNS checks, and apt installs.
Improve terminal handling: set TERM=xterm-256color only for SSH sessions by appending a guarded block to /root/.bashrc, disable /etc/profile.d/vte.{sh,csh} by renaming them to avoid CSI 6n prompt garbage on LXC/noVNC consoles, and add /etc/profile.d/00-lxc-term-size.sh to force a sane stty rows/cols when the pseudo-tty reports 0x0. These changes prevent locale-related errors and stray CSI responses in LXC containers.
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