feat: 添加告警画面截图相关设置

- 配置告警画面截图保留天数
- 是否自动获取告警画面截图

src/apis/request/biz/video/index.ts

@@ -3,4 +3,5 @@ export * from './ndm-camera-ignore';
 export * from './ndm-decoder';
 export * from './ndm-keyboard';
 export * from './ndm-media-server';
+export * from './ndm-snap';
 export * from './ndm-video-server';