feat(knowledge-base): 实现知识库文件夹功能和优化文件管理

- 添加 datasetId 和 filePath 字段到 DatasetFile 接口
- 实现 resolveRelativeFileName 函数用于解析相对文件名
- 在 AddDataDialog 中使用 resolveRelativeFileName 处理文件名
- 添加文件夹浏览功能，支持目录导航和层级显示
- 实现文件夹删除功能，可批量删除目录下所有文件
- 集成 Folder 和 File 图标组件用于目录和文件区分
- 优化文件列表加载逻辑，使用分页和关键词搜索
- 添加文件夹状态显示和相应操作按钮
- 实现文件路径前缀管理和子目录过滤
- 重构文件列表渲染逻辑，支持目录和文件混合展示

frontend/src/pages/KnowledgeBase/components/AddDataDialog.tsx

@@ -15,6 +15,7 @@ import { addKnowledgeBaseFilesUsingPost } from "../knowledge-base.api";
 import DatasetFileTransfer from "@/components/business/DatasetFileTransfer";
 import { DescriptionsItemType } from "antd/es/descriptions";
 import { DatasetFileCols } from "../knowledge-base.const";
+import type { DatasetFile } from "@/pages/DataManagement/dataset.model";
 
 export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
   const [open, setOpen] = useState(false);
@@ -25,6 +26,34 @@ export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
 
   const [selectedFilesMap, setSelectedFilesMap] = useState({});
 
+  const normalizePath = (value?: string) =>
+    (value ?? "").replace(/\\/g, "/");
+
+  const resolveRelativeFileName = (file: DatasetFile) => {
+    const normalizedName = normalizePath(file.fileName);
+    if (normalizedName.includes("/")) {
+      return normalizedName.replace(/^\/+/, "");
+    }
+
+    const rawPath = normalizePath(file.path || file.filePath);
+    const datasetId = String(file.datasetId || "");
+    if (rawPath && datasetId) {
+      const marker = `/${datasetId}/`;
+      const index = rawPath.lastIndexOf(marker);
+      if (index >= 0) {
+        const relative = rawPath
+          .slice(index + marker.length)
+          .replace(/^\/+/, "");
+        if (relative) {
+          return relative;
+        }
+      }
+    }
+
+    const fallbackName = rawPath.split("/").pop();
+    return fallbackName || file.fileName;
+  };
+
   // 定义分块选项
   const sliceOptions = [
     { label: "默认分块", value: "DEFAULT_CHUNK" },
@@ -129,7 +158,7 @@ export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
       const requestData = {
         files: Object.values(selectedFilesMap).map((file) => ({
           id: String(file.id),
-          fileName: file.fileName,
+          fileName: resolveRelativeFileName(file as DatasetFile),
         })),
         processType: newKB.processType,
         chunkSize: Number(newKB.chunkSize), // 确保是数字类型