Add end-to-end tests for workspace switching and backend tests for ask_question tool

- Implemented E2E tests for workspace switching functionality, covering scenarios such as switching workspaces, data isolation, language preference maintenance, and UI updates.
- Added tests to ensure workspace data is cleared on logout and handles unsaved changes during workspace switches.
- Created comprehensive backend tests for the ask_question tool, validating question creation, execution, answer handling, cancellation, and timeout scenarios.
- Included edge case tests to ensure robustness against duplicate questions and invalid answers.

ccw/frontend/src/locales/en/common.json

@@ -5,7 +5,8 @@
     "switchToLightMode": "Switch to light mode",
     "switchToDarkMode": "Switch to dark mode",
     "userMenu": "User menu",
-    "actions": "Actions"
+    "actions": "Actions",
+    "notifications": "Notifications"
   },
   "actions": {
     "save": "Save",
@@ -179,5 +180,13 @@
       "documentation": "Documentation",
       "tutorials": "Tutorials"
     }
+  },
+  "askQuestion": {
+    "defaultTitle": "Questions",
+    "description": "Please answer the following questions",
+    "textPlaceholder": "Enter your answer...",
+    "yes": "Yes",
+    "no": "No",
+    "required": "This question is required"
   }
 }

ccw/frontend/src/locales/zh/common.json

@@ -5,7 +5,8 @@
     "switchToLightMode": "切换到浅色模式",
     "switchToDarkMode": "切换到深色模式",
     "userMenu": "用户菜单",
-    "actions": "操作"
+    "actions": "操作",
+    "notifications": "通知"
   },
   "actions": {
     "save": "保存",
@@ -179,5 +180,13 @@
       "documentation": "文档",
       "tutorials": "教程"
     }
+  },
+  "askQuestion": {
+    "defaultTitle": "问题",
+    "description": "请回答以下问题",
+    "textPlaceholder": "输入您的答案...",
+    "yes": "是",
+    "no": "否",
+    "required": "此问题为必填项"
   }
 }