Function migrateToUnifiedDirs

apps/desktop/main/paths.ts:627–731

()

 * 7. 留 MOVED.txt 说明文件
 */
export function migrateToUnifiedDirs(): { success: boolean; error?: string } {
  const oldDataDir = resolveOldElectronDataDir()
  const systemDir = getSystemDataDir()

  console.log(`[Migration] Starting unified dir migration: ${oldDataDir} → ${systemDir}`)

  try {
    // Step 1: 创建系统目录
    ensureDir(systemDir)

    // Step 2: 如果当前 user_data_dir 指向了别处（如 CLI 写入的默认路径），
    // 且那里有数据库，先合并到旧 Electron 路径
    const config = loadConfig()
    const prevUserDataDir = config.data.user_data_dir
    if (prevUserDataDir && path.resolve(prevUserDataDir) !== path.resolve(oldDataDir)) {
      const prevDbDir = path.join(prevUserDataDir, 'databases')
      const oldDbDir = path.join(oldDataDir, 'databases')
      if (fs.existsSync(prevDbDir)) {
        const dbFiles = fs.readdirSync(prevDbDir).filter((f) => f.endsWith('.db'))
        if (dbFiles.length > 0) {
          ensureDir(oldDbDir)
          const result = copyDirMerge(prevDbDir, oldDbDir, ensureDir)
          console.log(
            `[Migration] Merged ${result.copied} databases from ${prevDbDir} to ${oldDbDir} (skipped ${result.skipped})`
          )
        }
      }
    }

    // Step 3: 写入 config.toml（数据库保留在旧 Electron 路径）
    writeConfigField('data', 'user_data_dir', oldDataDir)
    _userDataDir = oldDataDir

    // 如果 storage.json 有自定义 dataDir，也记录日志
    const storageConfig = readStorageConfig()
    if (storageConfig.dataDir) {
      console.log(`[Migration] Migrated storage.json custom path: ${storageConfig.dataDir}`)
    }

    // Step 4: 复制系统数据（合并，不覆盖 ~/.chatlab/ 下已有的文件）
    const movedDirs: string[] = []
    const failedDirs: string[] = []

    for (const subDir of SYSTEM_SUBDIRS) {
      const srcDir = path.join(oldDataDir, subDir)
      const destDir = path.join(systemDir, subDir)

      if (!fs.existsSync(srcDir)) continue

      try {
        ensureDir(destDir)
        const mergeResult = copyDirMerge(srcDir, destDir, ensureDir)

        if (mergeResult.copied > 0 || mergeResult.skipped > 0) {
          movedDirs.push(subDir)
          console.log(`[Migration] ${subDir}: copied ${mergeResult.copied}, skipped ${mergeResult.skipped}`)
        }
      } catch (err) {