feat: 获取用户对话列表，标题长度限制

src/main/java/cn/com/poc/expose/rest/impl/AgentApplicationRestImpl.java

@@ -152,7 +152,8 @@ public class AgentApplicationRestImpl implements AgentApplicationRest {
             result = memberDialoguesQueryItems.stream().map(item -> {
                 UserDialoguesDto userDialoguesDto = new UserDialoguesDto();
                 userDialoguesDto.setDialogsId(item.getDialogsId());
-                userDialoguesDto.setContent(item.getContent());
+                String content = item.getContent().length() > 20 ? item.getContent().substring(0, 20)  : item.getContent();
+                userDialoguesDto.setContent(content);
                 return userDialoguesDto;
             }).collect(Collectors.toList());
         }