fix:保证json快照一致性

src/main/java/com/iflytop/handacid/app/core/state/DeviceState.java

@@ -46,6 +46,9 @@ public class DeviceState {
     @Schema(description = "当前登录用户")
     private volatile User currentUser;
 
+    /**
+     * 获得当前设备的json快照，增加synchronized保证强一致
+     */
     public synchronized JSONObject toJSON() {
         JSONObject json = new JSONObject();
         json.putOnce("channelState", new ArrayList<>(channelStateMap.values()));