✨ feat: Add console announcements and FAQ management system

- Add SettingsAnnouncements component with full CRUD operations for system announcements
  * Support multiple announcement types (default, ongoing, success, warning, error)
  * Include publish date, content, type classification and additional notes
  * Implement batch operations and pagination for better data management
  * Add real-time preview with relative time display and date formatting

- Add SettingsFAQ component for comprehensive FAQ management
  * Support question-answer pairs with rich text content
  * Include full editing, deletion and creation capabilities
  * Implement batch delete operations and paginated display
  * Add validation for complete Q&A information

- Integrate announcement and FAQ modules into DashboardSetting
  * Add unified configuration interface in admin console
  * Implement auto-refresh functionality for real-time updates
  * Add loading states and error handling for better UX

- Enhance backend API support in controller and setting modules
  * Add validation functions for console settings
  * Include time and sorting utilities for announcement management
  * Extend API endpoints for announcement and FAQ data persistence

- Improve frontend infrastructure
  * Add new translation keys for internationalization support
  * Update utility functions for date/time formatting
  * Enhance CSS styles for better component presentation
  * Add icons and visual improvements for announcements and FAQ sections

This implementation provides administrators with comprehensive tools to manage
system-wide announcements and user FAQ content through an intuitive console interface.

web/src/index.css

@@ -301,12 +301,12 @@ code {
   font-size: 1.1em;
 }
 
-/* API信息卡片样式 */
-.api-info-container {
+/* 卡片内容容器通用样式 */
+.card-content-container {
   position: relative;
 }
 
-.api-info-fade-indicator {
+.card-content-fade-indicator {
   position: absolute;
   bottom: 0;
   left: 0;
@@ -374,8 +374,8 @@ code {
   background: transparent;
 }
 
-/* 隐藏模型设置区域的滚动条 */
-.api-info-scroll::-webkit-scrollbar,
+/* 隐藏卡片内容区域的滚动条 */
+.card-content-scroll::-webkit-scrollbar,
 .model-settings-scroll::-webkit-scrollbar,
 .thinking-content-scroll::-webkit-scrollbar,
 .custom-request-textarea .semi-input::-webkit-scrollbar,
@@ -383,7 +383,7 @@ code {
   display: none;
 }
 
-.api-info-scroll,
+.card-content-scroll,
 .model-settings-scroll,
 .thinking-content-scroll,
 .custom-request-textarea .semi-input,