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/zh/theme.json

@@ -0,0 +1,21 @@
+{
+  "title": {
+    "colorScheme": "颜色主题",
+    "themeMode": "明暗模式"
+  },
+  "colorScheme": {
+    "blue": "经典蓝",
+    "green": "深邃绿",
+    "orange": "活力橙",
+    "purple": "优雅紫"
+  },
+  "themeMode": {
+    "light": "浅色",
+    "dark": "深色"
+  },
+  "select": {
+    "colorScheme": "选择{name}主题",
+    "themeMode": "选择{name}模式"
+  },
+  "current": "当前主题: {name}"
+}