fix(dashboard): 修复 ActivityType 类型不兼容错误

将 RecentActivity 组件的 ActivityItem 接口替换为
使用统一的 DashboardActivity 类型，确保类型一致性。

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/admin-web/src/components/features/dashboard/RecentActivity/RecentActivity.tsx

@@ -2,19 +2,11 @@
 
 import { FC } from 'react';
 import { Card } from '@/components/common';
+import type { DashboardActivity } from '@/types';
 import styles from './RecentActivity.module.scss';
 
-interface ActivityItem {
-  id: string;
-  type: 'user_register' | 'company_activity' | 'system_update' | 'report_generated';
-  icon: string;
-  title: string;
-  description: string;
-  timestamp: string;
-}
-
 export interface RecentActivityProps {
-  activities: ActivityItem[];
+  activities: DashboardActivity[];
 }
 
 export const RecentActivity: FC<RecentActivityProps> = ({ activities }) => {