新增: 云OSS存储集成（七牛云+阿里云）+多桶导航+GBK编码自动转换

frontend/src/components/FileSystem/composables/useFilePreview.ts

@@ -9,6 +9,7 @@ import { normalizeFilePath, getExt } from '@/utils/fileUtils'
 import { detectFileTypeByContent } from '@/api/system'
 import { connectionManager } from '@/api/connection-manager'
 import { SftpTransport } from '@/api/sftp-transport'
+import { OssTransport } from '@/api/oss-transport'
 import { getFileServerBaseURL } from '@/api/file-server'
 import {
   isImageFile, isVideoFile, isAudioFile, isPdfFile,
@@ -106,22 +107,25 @@ export function useFilePreview(options: UseFilePreviewOptions = {}) {
   }
 
   /**
-   * 更新预览 URL（SFTP 模式会先下载到本地临时目录）
+   * 更新预览 URL
+   * SFTP/OSS：下载到本地临时目录后用本地文件服务器预览
    */
   const updatePreviewUrl = async (path: string) => {
     if (!path) { previewUrl.value = ''; return }
+    const transport = connectionManager.getTransport()
 
-    // SFTP 模式：下载到本地临时目录后用本地文件服务器预览
-    if (connectionManager.isSftp()) {
-      const transport = connectionManager.getTransport()
-      if (transport instanceof SftpTransport) {
-        try {
-          const tempPath = await transport.downloadForPreview(path)
-          previewUrl.value = getPreviewUrl(tempPath)
-          return
-        } catch {
-          // 下载失败，回退显示原始路径（会无法预览但不会崩溃）
-        }
+    // SFTP / OSS：下载到本地临时目录后用本地文件服务器预览
+    if (transport instanceof SftpTransport || transport instanceof OssTransport) {
+      try {
+        const tempPath = await transport.downloadForPreview(path)
+        // 临时文件通过本地文件服务器提供，始终用 localfs 路径
+        const base = getLocalServerURL()
+        const normalized = normalizeFilePath(tempPath, true)
+        const sep = base.endsWith('/') ? '' : '/'
+        previewUrl.value = `${base}${sep}localfs/${normalized}`
+        return
+      } catch {
+        // 下载失败，回退
       }
     }