feat(app): 添加场景模式配置字段

- 在AppScenicController中新增scene_mode配置项
- 默认值设置为0
- 支持从scenicConfig获取场景模式配置

src/main/java/com/ycwl/basic/model/pc/scenic/resp/ScenicConfigResp.java

@@ -72,4 +72,5 @@ public class ScenicConfigResp {
     private String videoSourcePackHint = "";
     private Boolean shareBeforeBuy = true;
     private Boolean faceSelectFirst = false;
+    private Integer sceneMode = 0;
 }