* fix: derive LXC banner OS from os-release
Read os-release at login time for the generated LXC banner so OS display stays accurate after template changes or in-place upgrades. Prefer PRETTY_NAME with safe fallbacks to NAME, template defaults, and Unknown OS while preserving existing banner formatting.
Co-authored-by: Cursor <cursoragent@cursor.com>
* refactor: simplify dynamic LXC banner OS resolution
Reduce banner OS rendering to a minimal runtime os-release read with PRETTY_NAME/NAME fallbacks and Unknown OS default. Remove redundant OS rewrites from update_motd_ip now that OS display is resolved dynamically at login.
Co-authored-by: Cursor <cursoragent@cursor.com>
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Co-authored-by: Cursor <cursoragent@cursor.com>
