#3212 fix：

1.优化知识库连接RAGFlow异常提示，修改前端卡片提示样式

main/manager-api/src/main/java/xiaozhi/modules/knowledge/dto/KnowledgeBaseDTO.java

@@ -67,4 +67,7 @@ public class KnowledgeBaseDTO implements Serializable {
 
     @Schema(description = "文档数量")
     private Integer documentCount;
+
+    @Schema(description = "异常提示")
+    private String errorMessage;
 }

main/manager-api/src/main/java/xiaozhi/modules/knowledge/service/impl/KnowledgeBaseServiceImpl.java

@@ -147,6 +147,7 @@ public class KnowledgeBaseServiceImpl extends BaseServiceImpl<KnowledgeBaseDao,
         } catch (Exception e) {
             log.warn("同步数据集信息失败 {}: {}", dto.getName(), e.getMessage());
             dto.setDocumentCount(0);
+            dto.setErrorMessage(e.getMessage());
         }
     }