feat(data-management): 添加数据集相似度推荐功能

- 在DatasetApplicationService中实现getSimilarDatasets方法，支持基于标签匹配的相似数据集推荐
- 新增normalizeSimilarLimit、normalizeTagNames、countSharedTags等辅助方法用于相似度计算
- 在DatasetRepository接口及其实现类中添加findSimilarByTags方法，支持数据库层面的标签匹配查询
- 在DatasetController中暴露/similar REST API端点，支持按需获取相似数据集
- 在前端Overview组件中展示相似数据集表格，包含名称、标签、类型、文件数和更新时间等信息
- 在DatasetDetail页面集成相似数据集获取逻辑，限制默认返回数量为4条
- 移除KnowledgeItem中的冗余title字段，统一使用其他标识信息
- 优化知识管理相关组件中的标题显示逻辑，移除硬编码标题值

frontend/src/pages/DataManagement/Detail/DatasetDetail.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useState } from "react";
+import { useEffect, useMemo, useRef, useState } from "react";
 import { Breadcrumb, App, Tabs, Table, Tag } from "antd";
 import {
   ReloadOutlined,
@@ -19,6 +19,7 @@ import {
   queryDatasetByIdUsingGet,
   queryDatasetsUsingGet,
   queryDatasetTagsUsingGet,
+  querySimilarDatasetsUsingGet,
   updateDatasetByIdUsingPut,
 } from "../dataset.api";
 import DataQuality from "./components/DataQuality";
@@ -26,8 +27,10 @@ import DataLineageFlow from "./components/DataLineageFlow";
 import Overview from "./components/Overview";
 import { Activity, Clock, File, FileType } from "lucide-react";
 import EditDataset from "../Create/EditDataset";
-import ImportConfiguration from "./components/ImportConfiguration";
-
+import ImportConfiguration from "./components/ImportConfiguration";
+
+const SIMILAR_DATASET_LIMIT = 4;
+
 export default function DatasetDetail() {
   const { id } = useParams(); // 获取动态路由参数
   const navigate = useNavigate();
@@ -39,9 +42,61 @@ export default function DatasetDetail() {
   const [parentDataset, setParentDataset] = useState<Dataset | null>(null);
   const [childDatasets, setChildDatasets] = useState<Dataset[]>([]);
   const [childDatasetsLoading, setChildDatasetsLoading] = useState(false);
+  const [similarDatasets, setSimilarDatasets] = useState<Dataset[]>([]);
+  const [similarDatasetsLoading, setSimilarDatasetsLoading] = useState(false);
+  const [similarTagNames, setSimilarTagNames] = useState<string[]>([]);
+  const similarRequestRef = useRef(0);
   const filesOperation = useFilesOperation(dataset);
 
   const [showUploadDialog, setShowUploadDialog] = useState(false);
+  const normalizeTagNames = (
+    tags?: Array<string | { name?: string | null } | null>
+  ) => {
+    if (!tags || tags.length === 0) {
+      return [];
+    }
+    const names = tags
+      .map((tag) => (typeof tag === "string" ? tag : tag?.name))
+      .filter((name): name is string => !!name && name.trim().length > 0)
+      .map((name) => name.trim());
+    return Array.from(new Set(names));
+  };
+  const fetchSimilarDatasets = async (currentDataset: Dataset) => {
+    const requestId = similarRequestRef.current + 1;
+    similarRequestRef.current = requestId;
+    if (!currentDataset?.id) {
+      setSimilarDatasets([]);
+      setSimilarTagNames([]);
+      setSimilarDatasetsLoading(false);
+      return;
+    }
+    const tagNames = normalizeTagNames(
+      currentDataset.tags as Array<string | { name?: string }>
+    );
+    setSimilarTagNames(tagNames);
+    setSimilarDatasets([]);
+    if (tagNames.length === 0) {
+      setSimilarDatasetsLoading(false);
+      return;
+    }
+    setSimilarDatasetsLoading(true);
+    try {
+      const { data } = await querySimilarDatasetsUsingGet(currentDataset.id, {
+        limit: SIMILAR_DATASET_LIMIT,
+      });
+      if (similarRequestRef.current !== requestId) {
+        return;
+      }
+      const list = Array.isArray(data) ? data : [];
+      setSimilarDatasets(list.map((item) => mapDataset(item)));
+    } catch (error) {
+      console.error("Failed to fetch similar datasets:", error);
+    } finally {
+      if (similarRequestRef.current === requestId) {
+        setSimilarDatasetsLoading(false);
+      }
+    }
+  };
   const navigateItems = useMemo(() => {
     const items = [
       {
@@ -110,6 +165,7 @@ export default function DatasetDetail() {
     const { data } = await queryDatasetByIdUsingGet(id);
     const mapped = mapDataset(data);
     setDataset(mapped);
+    fetchSimilarDatasets(mapped);
     if (data?.parentDatasetId) {
       const { data: parentData } = await queryDatasetByIdUsingGet(
         data.parentDatasetId
@@ -351,6 +407,9 @@ export default function DatasetDetail() {
               filesOperation={filesOperation}
               fetchDataset={fetchDataset}
               onUpload={() => setShowUploadDialog(true)}
+              similarDatasets={similarDatasets}
+              similarDatasetsLoading={similarDatasetsLoading}
+              similarTags={similarTagNames}
             />
           )}
           {activeTab === "children" && (