0.1.0

feat: Port MentionSound plugin to AllayMC

- Add chat mention detection (@playerName and @here)
- Support names with spaces (@"player name" format)
- Add customizable settings form UI
- Add /mentionsound command with settings and soundlist subcommands
- Add i18n support (en_US, zh_CN)
- Add per-player YAML settings persistence
- Update README with documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>