dsh-ac-trouble: AC Troubleshooting

The `dsh-ac-trouble` plugin for DeepSeek Harness (DSH) adopts a plugin-based architecture and is dedicated to air conditioning troubleshooting scenarios. Built with Node.js, it has no external network dependencies, supports parameterized queries, and can directly return troubleshooting steps. It can be installed via command without additional configuration. The plugin is suitable for developers who need to quickly integrate local air conditioning diagnostics. However, users should be advised to seek professional assistance when issues involving electrical circuits or gas safety are encountered.