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/cli-monitor.json

@@ -0,0 +1,18 @@
+{
+  "title": "CLI Stream Monitor",
+  "searchPlaceholder": "Search output...",
+  "noExecutions": "No active CLI executions",
+  "noExecutionsHint": "Start a CLI command to see streaming output",
+  "selectExecution": "Select an execution to view output",
+  "status": {
+    "running": "Running",
+    "completed": "Completed",
+    "error": "Error"
+  },
+  "recovered": "Recovered",
+  "lines": "lines",
+  "autoScroll": "Auto-scroll",
+  "scrollToBottom": "Scroll to bottom",
+  "close": "Close",
+  "refresh": "Refresh"
+}