feat: Implement Cross-CLI Sync Panel for MCP servers

- Added CrossCliSyncPanel component for synchronizing MCP servers between Claude and Codex.
- Implemented server selection, copy operations, and result handling.
- Added tests for path mapping on Windows drives.
- Created E2E tests for ask_question Answer Broker functionality.
- Introduced MCP Tools Test Script for validating modified read_file and edit_file tools.
- Updated path_mapper to ensure correct drive formatting on Windows.
- Added .gitignore for ace-tool directory.

ccw/src/core/auth/middleware.ts

@@ -90,6 +90,7 @@ const LOCALHOST_PUBLIC_PATHS = [
   '/api/litellm-api/providers',
   '/api/litellm-api/endpoints',
   '/api/health',
+  '/api/a2ui/answer',
 ];
 
 /**