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/theme.json

@@ -0,0 +1,21 @@
+{
+  "title": {
+    "colorScheme": "Color Scheme",
+    "themeMode": "Theme Mode"
+  },
+  "colorScheme": {
+    "blue": "Classic Blue",
+    "green": "Deep Green",
+    "orange": "Vibrant Orange",
+    "purple": "Elegant Purple"
+  },
+  "themeMode": {
+    "light": "Light",
+    "dark": "Dark"
+  },
+  "select": {
+    "colorScheme": "Select {name} theme",
+    "themeMode": "Select {name} mode"
+  },
+  "current": "Current theme: {name}"
+}