feat(app): 新增分享前购买配置项

- 在AppScenicController中增加shareBeforeBuy配置项- 默认值设置为true以启用该功能- 更新响应对象以支持新的配置选项

src/main/java/com/ycwl/basic/controller/mobile/AppScenicController.java

@@ -93,6 +93,7 @@ public class AppScenicController {
         resp.setGroupingEnable(scenicConfig.getBoolean("grouping_enable", false));
         resp.setShowPhotoWhenWaiting(scenicConfig.getBoolean("show_photo_when_waiting", false));
         resp.setWatermarkUrl(scenicConfig.getString("watermark_url"));
+        resp.setShareBeforeBuy(scenicConfig.getBoolean("share_before_buy", true));
         return ApiResponse.success(resp);
     }