22230a3e3f
- Add SPA shell with hash-based router, sidebar navigation, and WebSocket RPC client - Add dashboard page with system health cards, channel status, and auto-refresh - Add chat page with session selector, streaming tool events, and markdown rendering - Add sessions page with list, history viewer, and delete functionality - Add settings page with hook pattern editor, tool list, and config viewer - Add backend handlers: sessions.delete, sessions.switch, system.channels, system.usage - Wire channelRegistry into gateway server for channel status reporting - Extend static file server with .mjs, .png, .ico, .woff2 content types