新增：管理后台前端页面，以及openspec内容。

openspec/changes/add-admin-web/tasks.md

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+## 1. Project Setup
+- [ ] 1.1 Initialize Vue 3.x project with Vite
+- [ ] 1.2 Install Element Plus UI framework
+- [ ] 1.3 Install vue-router for routing
+- [ ] 1.4 Install Pinia for state management
+- [ ] 1.5 Install axios for HTTP requests
+- [ ] 1.6 Configure project structure
+
+## 2. Authentication System
+- [ ] 2.1 Create Login page component
+- [ ] 2.2 Implement authentication store with Pinia
+- [ ] 2.3 Configure route guards for protected routes
+- [ ] 2.4 Implement token storage in localStorage
+- [ ] 2.5 Add logout functionality
+
+## 3. Layout and Navigation
+- [ ] 3.1 Create main Layout component with sidebar
+- [ ] 3.2 Implement responsive design for mobile/desktop
+- [ ] 3.3 Create navigation menu
+- [ ] 3.4 Add header with user info and theme toggle
+
+## 4. Theme Management
+- [ ] 4.1 Create theme store with Pinia
+- [ ] 4.2 Implement dark/light theme switching
+- [ ] 4.3 Configure Element Plus theme
+- [ ] 4.4 Persist theme preference in localStorage
+
+## 5. User Management
+- [ ] 5.1 Create UserList page component
+- [ ] 5.2 Implement user data table with Element Plus
+- [ ] 5.3 Add search functionality
+- [ ] 5.4 Add pagination support
+- [ ] 5.5 Integrate with backend API
+
+## 6. Conversation Management
+- [ ] 6.1 Create ConversationList page component
+- [ ] 6.2 Implement conversation data table
+- [ ] 6.3 Add filtering by message type
+- [ ] 6.4 Add search functionality
+- [ ] 6.5 Add pagination support
+- [ ] 6.6 Integrate with backend API
+
+## 7. HTTP Client Configuration
+- [ ] 7.1 Create axios instance with base URL
+- [ ] 7.2 Implement request interceptors
+- [ ] 7.3 Implement response interceptors
+- [ ] 7.4 Add error handling
+
+## 8. Routing Configuration
+- [ ] 8.1 Configure vue-router
+- [ ] 8.2 Define public routes (login)
+- [ ] 8.3 Define protected routes (dashboard, users, conversations)
+- [ ] 8.4 Implement route guards
+
+## 9. Dashboard
+- [ ] 9.1 Create Home/Dashboard page
+- [ ] 9.2 Display statistics cards
+- [ ] 9.3 Show recent activity
+
+## 10. Testing and Deployment
+- [ ] 10.1 Test authentication flow
+- [ ] 10.2 Test user management features
+- [ ] 10.3 Test conversation management features
+- [ ] 10.4 Test responsive design
+- [ ] 10.5 Test theme switching
+- [ ] 10.6 Verify all API integrations