feat(a2ui): Implement A2UI backend with question handling and WebSocket support

- Added A2UITypes for defining question structures and answers.
- Created A2UIWebSocketHandler for managing WebSocket connections and message handling.
- Developed ask-question tool for interactive user questions via A2UI.
- Introduced platformUtils for platform detection and shell command handling.
- Centralized TypeScript types in index.ts for better organization.
- Implemented compatibility checks for hook templates based on platform requirements.

ccw/src/core/server.ts

@@ -579,8 +579,8 @@ export async function startServer(options: ServerOptions = {}): Promise<http.Ser
         if (await handleGraphRoutes(routeContext)) return;
       }
 
-      // CCW routes (/api/ccw/*)
-      if (pathname.startsWith('/api/ccw/')) {
+      // CCW routes (/api/ccw and /api/ccw/*)
+      if (pathname.startsWith('/api/ccw')) {
         if (await handleCcwRoutes(routeContext)) return;
       }