✨ 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/helpers/utils.js

@@ -446,3 +446,66 @@ export const getLastAssistantMessage = (messages) => {
   }
   return null;
 };
+
+// 计算相对时间（几天前、几小时前等）
+export const getRelativeTime = (publishDate) => {
+  if (!publishDate) return '';
+
+  const now = new Date();
+  const pubDate = new Date(publishDate);
+
+  // 如果日期无效，返回原始字符串
+  if (isNaN(pubDate.getTime())) return publishDate;
+
+  const diffMs = now.getTime() - pubDate.getTime();
+  const diffSeconds = Math.floor(diffMs / 1000);
+  const diffMinutes = Math.floor(diffSeconds / 60);
+  const diffHours = Math.floor(diffMinutes / 60);
+  const diffDays = Math.floor(diffHours / 24);
+  const diffWeeks = Math.floor(diffDays / 7);
+  const diffMonths = Math.floor(diffDays / 30);
+  const diffYears = Math.floor(diffDays / 365);
+
+  // 如果是未来时间，显示具体日期
+  if (diffMs < 0) {
+    return formatDateString(pubDate);
+  }
+
+  // 根据时间差返回相应的描述
+  if (diffSeconds < 60) {
+    return '刚刚';
+  } else if (diffMinutes < 60) {
+    return `${diffMinutes} 分钟前`;
+  } else if (diffHours < 24) {
+    return `${diffHours} 小时前`;
+  } else if (diffDays < 7) {
+    return `${diffDays} 天前`;
+  } else if (diffWeeks < 4) {
+    return `${diffWeeks} 周前`;
+  } else if (diffMonths < 12) {
+    return `${diffMonths} 个月前`;
+  } else if (diffYears < 2) {
+    return '1 年前';
+  } else {
+    // 超过2年显示具体日期
+    return formatDateString(pubDate);
+  }
+};
+
+// 格式化日期字符串
+export const formatDateString = (date) => {
+  const year = date.getFullYear();
+  const month = String(date.getMonth() + 1).padStart(2, '0');
+  const day = String(date.getDate()).padStart(2, '0');
+  return `${year}-${month}-${day}`;
+};
+
+// 格式化日期时间字符串（包含时间）
+export const formatDateTimeString = (date) => {
+  const year = date.getFullYear();
+  const month = String(date.getMonth() + 1).padStart(2, '0');
+  const day = String(date.getDate()).padStart(2, '0');
+  const hours = String(date.getHours()).padStart(2, '0');
+  const minutes = String(date.getMinutes()).padStart(2, '0');
+  return `${year}-${month}-${day} ${hours}:${minutes}`;
+};