Files
半圭 34c0c86a59 feat: center protocol upload/download refactoring with multipart download
- Add multipart download engine (drive_transfer.go) with Range probe,
  resume support, and credential auto-refresh on 401/403
- Add --part-size, --parallel, --no-resume flags to drive download and
  download-version commands
- Replace httpGetFile with driveTransferDownload for chunked parallel
  downloads in download and download-version commands
- Replace uploadToDrive credential parsing with driveUploadPut
  (transparent header pass-through, retry on 401/403)
- Add typed httpStatusError for non-2xx HTTP responses in doc.go
- Add comprehensive unit tests (32 cases) for drive_transfer
- Update drive reference documentation with multipart download behavior
- Add E2E test for multipart download (auto-test/, gitignored)

CR: 28984991
2026-08-03 23:21:59 +08:00
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