杂活：为ExtendedBodyPosition添加注释

src/states/exam/bodyPositionListSlice.ts

@@ -5,7 +5,9 @@ import { dview } from '@/domain/dview';
 import emitter from '@/utils/eventEmitter';
 import store from '@/states/store';
 import { MqttMessage } from '@/domain/mqttService';
-
+/**
+ * ExtendedBodyPosition即包含体位模块信息，又包含体位实例信息，也包括study（work）信息
+ */
 export interface ExtendedBodyPosition extends BodyPosition {
   patient_name: string;
   patient_id: string;