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/frontend/src/locales/en/navigation.json

@@ -11,11 +11,16 @@
     "skills": "Skills",
     "commands": "Commands",
     "memory": "Memory",
+    "prompts": "Prompt History",
     "settings": "Settings",
     "mcp": "MCP Servers",
     "endpoints": "CLI Endpoints",
     "installations": "Installations",
-    "help": "Help"
+    "help": "Help",
+    "hooks": "Hooks",
+    "rules": "Rules",
+    "explorer": "File Explorer",
+    "graph": "Graph Explorer"
   },
   "sidebar": {
     "collapse": "Collapse",