im修改成异步发送

fs-service/src/main/java/com/fs/im/service/impl/OpenIMServiceImpl.java

@@ -1175,6 +1175,7 @@ public class OpenIMServiceImpl implements OpenIMService {
 
 
     @Override
+    @Async
     public OpenImResponseDTO batchSendCourseLimit(BatchSendCourseDTO batchSendCourseDTO) {
         ObjectMapper objectMapper = new ObjectMapper();
         objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL); // 忽略 null 字段