feat: refactor conversations page into a workbench layout and implement workspace switching

- Migrate ConversationsPage to use ConversationWorkbench component.
- Create WorkbenchLayout to handle authentication and layout for workbench.
- Add WorkbenchPage to render ConversationWorkbench.
- Implement WorkspaceSwitcher for switching between dashboard and workbench.
- Update AuthProvider to manage authentication for both dashboard and workbench routes.
- Enhance WorkbenchHeader with user menu and workspace switcher.
- Add tests for workspace switcher and auth provider functionality.
- Update translations for workspace labels in English and Chinese.
- Exclude e2e tests from TypeScript compilation.

web/messages/en-US.json

@@ -2351,6 +2351,11 @@
     "changePassword": "Change Password",
     "signOut": "Sign Out"
   },
+  "workspace": {
+    "dashboard": "Admin Dashboard",
+    "workbench": "Support Workbench",
+    "switchWorkspace": "Switch workspace"
+  },
   "theme": {
     "toggle": "Change theme",
     "light": "Light",

web/messages/zh-CN.json

@@ -2351,6 +2351,11 @@
     "changePassword": "修改密码",
     "signOut": "退出登录"
   },
+  "workspace": {
+    "dashboard": "管理后台",
+    "workbench": "客服工作台",
+    "switchWorkspace": "切换工作区"
+  },
   "theme": {
     "toggle": "切换主题",
     "light": "浅色模式",