新增: 文件操作增强与预览扩展

- 文件剪贴板复制剪切粘贴，重名自动副本
- SFTP下载到本机与外部文件拖入，目录递归
- 传输进度浮动面板，transfer-progress事件链
- Drawio预览，Excel工作线程，冻结看门狗
- cmd与bat自写batch语法高亮，psm1等映射补齐

frontend/src/api/wails-transport.ts

@@ -3,25 +3,20 @@
  */
 
 import type { FsTransport, FileItem, FileOperationResult, DetectTypeResult } from './transport'
+import { transformFile, transformFileList, joinPath } from './transport'
 import {
   ListDir, GetFileInfo, ReadFile, WriteFile, SaveBase64File,
-  CreateFile, CreateDir, DeletePath, RenamePath,
+  CreateFile, CreateDir, DeletePath, RenamePath, CopyPath, MovePath,
   ListZipContents, ExtractFileFromZip, ExtractFileFromZipToTemp, GetZipFileInfo,
   OpenPath, GetFileServerURL, ResolveShortcut, DetectFileTypeByContent,
   GetCommonPaths, GetRecycleBinEntries, RestoreFromRecycleBin,
-  DeletePermanently, EmptyRecycleBin
+  DeletePermanently, EmptyRecycleBin,
+  WatchFile, UnwatchFile
 } from '../wailsjs/v3-bindings/u-desk/app'
 
-function transformFile(file: any): FileItem {
-  return { ...file, is_dir: file.is_dir, mod_time: file.mod_time }
-}
-
-function transformFileList(files: any[]): FileItem[] {
-  return files.map(transformFile)
-}
-
 export class WailsTransport implements FsTransport {
   async listDir(path: string): Promise<FileItem[]> {
+    // 蛇形→驼峰转换统一由 system.ts 的 toFileItemList 完成，此处仅类型适配
     return transformFileList(await ListDir(path))
   }
 
@@ -43,13 +38,11 @@ export class WailsTransport implements FsTransport {
   }
 
   async createFile(dirPath: string, filename: string): Promise<FileOperationResult> {
-    const fullPath = dirPath.replace(/\/$/, '') + '/' + filename
-    return CreateFile(fullPath)
+    return CreateFile(joinPath(dirPath, filename))
   }
 
   async createDir(parentPath: string, dirname: string): Promise<FileOperationResult> {
-    const fullPath = parentPath.replace(/\/$/, '') + '/' + dirname
-    return CreateDir(fullPath)
+    return CreateDir(joinPath(parentPath, dirname))
   }
 
   async deletePath(path: string): Promise<FileOperationResult> {
@@ -60,6 +53,22 @@ export class WailsTransport implements FsTransport {
     return RenamePath({ oldPath: String(oldPath), newPath: String(newPath) })
   }
 
+  async copyPath(src: string, dst: string): Promise<void> {
+    await CopyPath(String(src), String(dst))
+  }
+
+  async movePath(src: string, dst: string): Promise<void> {
+    await MovePath(String(src), String(dst))
+  }
+
+  async downloadToFile(path: string, _localDstDir: string): Promise<string> {
+    return path // 本地文件无需下载
+  }
+
+  async uploadFromFile(_localPath: string, _remoteDir: string): Promise<void> {
+    // 本地面板无上传语义（外部文件拖入走 copyPath）
+  }
+
   async listZipContents(zipPath: string): Promise<FileItem[]> {
     return transformFileList(await ListZipContents(zipPath))
   }
@@ -73,7 +82,7 @@ export class WailsTransport implements FsTransport {
   }
 
   async getZipFileInfo(zipPath: string, filePath: string): Promise<FileItem> {
-    return transform(await GetZipFileInfo(zipPath, filePath))
+    return transformFile(await GetZipFileInfo(zipPath, filePath))
   }
 
   async openPath(path: string): Promise<void> {
@@ -120,4 +129,12 @@ export class WailsTransport implements FsTransport {
   async downloadForPreview(path: string): Promise<string> {
     return path
   }
+
+  async watchFile(path: string): Promise<void> {
+    await WatchFile(path)
+  }
+
+  async unwatchFile(): Promise<void> {
+    await UnwatchFile()
+  }
 }