重构：Wails v3 迁移 + 前端目录规范化 + Sidebar滚动优化

- web/ → frontend/ 目录重命名（Wails v3 标准结构）
- main.go: Middleware 修复 custom.js 404 + DevTools 延迟启动
- Sidebar: 收藏夹内部独立滚动 + 帮助区块固定底部
- useFavorites.ts: longPressTimer const→let 修复 TypeError
- App.vue: Arco Tabs padding-top 覆盖
- build: config.yml / Taskfile.yml 对齐官方模板，devtools build tag
- 新增 v3 bindings、vite.config.js、跨平台构建配置

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/api/wails-transport.ts

@@ -0,0 +1,119 @@
+/**
+ * Wails Transport — 本地文件操作（通过 Wails v3 IPC）
+ */
+
+import type { FsTransport, FileItem, FileOperationResult, DetectTypeResult } from './transport'
+import {
+  ListDir, GetFileInfo, ReadFile, WriteFile, SaveBase64File,
+  CreateFile, CreateDir, DeletePath, RenamePath,
+  ListZipContents, ExtractFileFromZip, ExtractFileFromZipToTemp, GetZipFileInfo,
+  OpenPath, GetFileServerURL, ResolveShortcut, DetectFileTypeByContent,
+  GetCommonPaths, GetRecycleBinEntries, RestoreFromRecycleBin,
+  DeletePermanently, EmptyRecycleBin
+} 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[]> {
+    return transformFileList(await ListDir(path))
+  }
+
+  async getFileInfo(path: string): Promise<Record<string, any>> {
+    return GetFileInfo(path)
+  }
+
+  async readFile(path: string): Promise<string> {
+    return ReadFile(path)
+  }
+
+  async writeFile(path: string, content: string): Promise<void> {
+    await WriteFile({ path: String(path), content: String(content) })
+  }
+
+  async saveBase64File(path: string, content: string): Promise<void> {
+    if (!content) throw new Error('无效的 base64 内容')
+    await SaveBase64File({ path: String(path), content })
+  }
+
+  async createFile(dirPath: string, filename: string): Promise<FileOperationResult> {
+    const fullPath = dirPath.replace(/\/$/, '') + '/' + filename
+    return CreateFile(fullPath)
+  }
+
+  async createDir(parentPath: string, dirname: string): Promise<FileOperationResult> {
+    const fullPath = parentPath.replace(/\/$/, '') + '/' + dirname
+    return CreateDir(fullPath)
+  }
+
+  async deletePath(path: string): Promise<FileOperationResult> {
+    return DeletePath(path)
+  }
+
+  async renamePath(oldPath: string, newPath: string): Promise<FileOperationResult> {
+    return RenamePath({ oldPath: String(oldPath), newPath: String(newPath) })
+  }
+
+  async listZipContents(zipPath: string): Promise<FileItem[]> {
+    return transformFileList(await ListZipContents(zipPath))
+  }
+
+  async extractFileFromZip(zipPath: string, filePath: string): Promise<string> {
+    return ExtractFileFromZip(zipPath, filePath)
+  }
+
+  async extractFileFromZipToTemp(zipPath: string, filePath: string): Promise<string> {
+    return ExtractFileFromZipToTemp(zipPath, filePath)
+  }
+
+  async getZipFileInfo(zipPath: string, filePath: string): Promise<FileItem> {
+    return transform(await GetZipFileInfo(zipPath, filePath))
+  }
+
+  async openPath(path: string): Promise<void> {
+    await OpenPath(path)
+  }
+
+  async getFileServerURL(): Promise<string> {
+    return GetFileServerURL()
+  }
+
+  getPreviewToken(): string {
+    return '' // 本地模式无需 token
+  }
+
+  async resolveShortcut(lnkPath: string): Promise<any> {
+    return ResolveShortcut(lnkPath)
+  }
+
+  async detectFileTypeByContent(path: string): Promise<DetectTypeResult> {
+    const result = await DetectFileTypeByContent(path)
+    return result as unknown as DetectTypeResult
+  }
+
+  async getCommonPaths(): Promise<Record<string, string>> {
+    return GetCommonPaths()
+  }
+
+  async getRecycleBinEntries(): Promise<any[]> {
+    return GetRecycleBinEntries()
+  }
+
+  async restoreFromRecycleBin(path: string): Promise<void> {
+    await RestoreFromRecycleBin(path)
+  }
+
+  async deletePermanently(path: string): Promise<void> {
+    await DeletePermanently(path)
+  }
+
+  async emptyRecycleBin(): Promise<void> {
+    await EmptyRecycleBin()
+  }
+}