- :last [N]: show last N messages from log (max 50, default 10)
- :search <keyword>: case-insensitive full-text search across log history
- :mute-joins: per-client toggle to silence join/leave system messages,
indicated by [静音] in the title bar
- MOTD: display motd.txt from state directory on connect before entering chat
- Add message_search() to message.c/h for log file scanning
- Update :help and tui help screen (EN/ZH) with new commands