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/components/Overview.tsx

@@ -1,8 +1,19 @@
-import { App, Button, Descriptions, DescriptionsProps, Modal, Table, Input } from "antd";
-import { formatBytes, formatDateTime } from "@/utils/unit";
-import { Download, Trash2, Folder, File } from "lucide-react";
+import {
+  App,
+  Button,
+  Descriptions,
+  DescriptionsProps,
+  Modal,
+  Table,
+  Input,
+  Tag,
+} from "antd";
+import { formatBytes, formatDateTime } from "@/utils/unit";
+import { Download, Trash2, Folder, File } from "lucide-react";
 import { datasetTypeMap } from "../../dataset.const";
-import type { DatasetFile } from "@/pages/DataManagement/dataset.model";
+import type { Dataset, DatasetFile } from "@/pages/DataManagement/dataset.model";
+import { Link } from "react-router";
+import type { useFilesOperation } from "../useFilesOperation";
 
 type DatasetFileRow = DatasetFile & {
   fileSize?: number;
@@ -18,14 +29,29 @@ const PREVIEW_MODAL_WIDTH = {
 const PREVIEW_TEXT_FONT_SIZE = 12;
 const PREVIEW_TEXT_PADDING = 12;
 const PREVIEW_AUDIO_PADDING = 40;
-
+const SIMILAR_TAGS_PREVIEW_LIMIT = 3;
+const SIMILAR_DATASET_TAG_PREVIEW_LIMIT = 4;
+
+type OverviewProps = {
+  dataset: Dataset;
+  filesOperation: ReturnType<typeof useFilesOperation>;
+  fetchDataset: () => void;
+  onUpload?: () => void;
+  similarDatasets: Dataset[];
+  similarDatasetsLoading: boolean;
+  similarTags: string[];
+};
+
 export default function Overview({
   dataset,
   filesOperation,
   fetchDataset,
   onUpload,
-}) {
-  const { modal, message } = App.useApp();
+  similarDatasets,
+  similarDatasetsLoading,
+  similarTags,
+}: OverviewProps) {
+  const { modal, message } = App.useApp();
   const {
     fileList,
     pagination,
@@ -46,6 +72,82 @@ export default function Overview({
     handleDeleteDirectory,
     handlePreviewFile,
   } = filesOperation;
+  const similarTagsSummary = (() => {
+    if (!similarTags || similarTags.length === 0) {
+      return "";
+    }
+    const visibleTags = similarTags.slice(0, SIMILAR_TAGS_PREVIEW_LIMIT);
+    const hiddenCount = similarTags.length - visibleTags.length;
+    if (hiddenCount > 0) {
+      return `${visibleTags.join("、")} 等 ${similarTags.length} 个`;
+    }
+    return visibleTags.join("、");
+  })();
+  const renderDatasetTags = (
+    tags?: Array<string | { name?: string; color?: string } | null>
+  ) => {
+    if (!tags || tags.length === 0) {
+      return "-";
+    }
+    const visibleTags = tags.slice(0, SIMILAR_DATASET_TAG_PREVIEW_LIMIT);
+    const hiddenCount = tags.length - visibleTags.length;
+    return (
+      <div className="flex flex-wrap gap-1">
+        {visibleTags.map((tag, index) => {
+          const tagName = typeof tag === "string" ? tag : tag?.name;
+          if (!tagName) {
+            return null;
+          }
+          const tagColor = typeof tag === "string" ? undefined : tag?.color;
+          return (
+            <Tag key={`${tagName}-${index}`} color={tagColor}>
+              {tagName}
+            </Tag>
+          );
+        })}
+        {hiddenCount > 0 && <Tag>+{hiddenCount}</Tag>}
+      </div>
+    );
+  };
+  const similarColumns = [
+    {
+      title: "名称",
+      dataIndex: "name",
+      key: "name",
+      render: (_: string, record: Dataset) => (
+        <Link to={`/data/management/detail/${record.id}`}>{record.name}</Link>
+      ),
+    },
+    {
+      title: "标签",
+      dataIndex: "tags",
+      key: "tags",
+      render: (tags: Array<string | { name?: string; color?: string }>) =>
+        renderDatasetTags(tags),
+    },
+    {
+      title: "类型",
+      dataIndex: "datasetType",
+      key: "datasetType",
+      width: 120,
+      render: (_: string, record: Dataset) =>
+        datasetTypeMap[record.datasetType as keyof typeof datasetTypeMap]?.label ||
+        "未知",
+    },
+    {
+      title: "文件数",
+      dataIndex: "fileCount",
+      key: "fileCount",
+      width: 120,
+      render: (value?: number) => value ?? 0,
+    },
+    {
+      title: "更新时间",
+      dataIndex: "updatedAt",
+      key: "updatedAt",
+      width: 180,
+    },
+  ];
 
   // 基本信息
   const items: DescriptionsProps["items"] = [
@@ -265,7 +367,32 @@ export default function Overview({
           column={5}
         />
 
-        {/* 文件列表 */}
+        {/* 相似数据集 */}
+        <div className="mt-8">
+          <div className="flex items-center justify-between mb-3">
+            <h2 className="text-base font-semibold">相似数据集</h2>
+            {similarTagsSummary && (
+              <span className="text-xs text-gray-500">
+                匹配标签：{similarTagsSummary}
+              </span>
+            )}
+          </div>
+          <Table
+            size="small"
+            rowKey="id"
+            columns={similarColumns}
+            dataSource={similarDatasets}
+            loading={similarDatasetsLoading}
+            pagination={false}
+            locale={{
+              emptyText: similarTags?.length
+                ? "暂无相似数据集"
+                : "当前数据集未设置标签",
+            }}
+          />
+        </div>
+
+        {/* 文件列表 */}
         <div className="flex items-center justify-between mt-8 mb-2">
           <h2 className="text-base font-semibold">文件列表</h2>
           <div className="flex items-center gap-2">