#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());
         }
     }
 

main/manager-web/src/views/KnowledgeBaseManagement.vue

@@ -43,6 +43,11 @@
                   :class="{ active: selectedKb && selectedKb.datasetId === kb.datasetId }"
                   @click="selectKnowledgeBase(kb)"
                 >
+                  <el-tooltip v-if="kb.errorMessage" :content="kb.errorMessage" placement="bottom-start" effect="dark">
+                    <div class="kb-card-warning">
+                      <i class="el-icon-warning"></i>
+                    </div>
+                  </el-tooltip>
                   <div class="kb-card-actions-top">
                     <button class="kb-action-icon" :title="$t('knowledgeBaseManagement.edit')" @click.stop="editKnowledgeBase(kb)">
                       <i class="el-icon-edit"></i>
@@ -888,6 +893,22 @@ export default {
   margin-bottom: 12px;
 }
 
+.kb-card-warning {
+  position: absolute;
+  top: 2px;
+  left: 4px;
+  z-index: 2;
+  color: #e6a23c;
+  font-size: 16px;
+  cursor: pointer;
+  animation: warning-pulse 2s ease-in-out infinite;
+}
+
+@keyframes warning-pulse {
+  0%, 100% { opacity: 1; }
+  50% { opacity: 0.5; }
+}
+
 .kb-card-actions-top {
   position: absolute;
   top: 10px;