Channel plugin that bridges Claude Code to a running CloudPlayPlus Flutter app. Messages from remote CloudPlayPlus users are pushed into Claude Code as channel events, and Claude's replies are delivered back through the app. Unlike Telegram/Discord/iMessage channels, the MCP server runs inside the long-running CloudPlayPlus host app (over loopback HTTP), not as a Claude Code subprocess — so the app's existing user authentication gates every inbound message before it reaches the session.