feat: 事件详情页 URL ID 加密，防止用户遍历

- 新增 idEncoder.ts 工具：使用 Base64 + 前缀混淆加密 ID
- 路由改为查询参数形式：/event-detail?id=xxx
- 更新所有入口使用 getEventDetailUrl() 生成加密链接
- 兼容旧链接：纯数字 ID 仍可正常访问

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

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

src/contexts/NotificationContext.js

@@ -19,6 +19,7 @@ import { notificationMetricsService } from '../services/notificationMetricsServi
 import { notificationHistoryService } from '../services/notificationHistoryService';
 import { PRIORITY_LEVELS, NOTIFICATION_CONFIG, NOTIFICATION_TYPES } from '../constants/notificationTypes';
 import { usePermissionGuide, GUIDE_TYPES } from '../hooks/usePermissionGuide';
+import { getEventDetailUrl } from '@/utils/idEncoder';
 
 // 连接状态枚举
 const CONNECTION_STATUS = {
@@ -460,7 +461,7 @@ export const NotificationProvider = ({ children }) => {
             timestamp: Date.now(),
             isAIGenerated: event.is_ai_generated || false,
             clickable: true,
-            link: `/event-detail/${event.id}`,
+            link: getEventDetailUrl(event.id),
             autoClose: autoClose,
             extra: {
                 eventId: event.id,