dsh-museai-tavern: Running MuseAI Characters and Sessions in the DSH Web GUI

@yejiming/dsh-museai-tavern adds a new MuseAI tab to the right of the "Trajectory" tab in the DSH Web GUI session bar, embedding five pages: Background, Chat, Adventure, Bond, and Settings. It reuses the DSH-configured model, requiring no additional API. Data is stored in $DSH_HOME/storages/museai.json. Install via npm: dsh plugin --profile web add @yejiming/dsh-museai-tavern.