feat(documents): importer for organized S3/filesystem buckets

One-shot script that walks an existing organized bucket tree, builds
matching document_folders rows mirroring the path, then inserts
documents + files rows pointing at the existing storage keys verbatim
— no path rewrite. For migrating from a legacy MinIO bucket whose
folder structure is already the source of truth.

Idempotency:
  • Folders: sibling-name unique index swallows duplicate creates;
    we reuse the row on ConflictError.
  • Documents: skipped when (port_id, fileStoragePath) already exists.

Adds StorageBackend.listByPrefix (recursive readdir on filesystem;
listObjectsV2 stream-drain on s3) — the first one-shot caller, not
a hot path. Pure parseImportPath helper extracted to its own module
and unit-tested for trailing slashes, empty intermediate segments,
prefix mismatch, and special-character folder names (8 tests).

Audit log per imported doc carries source='organized-bucket-importer',
storageKey, and folderSegments so the documents inspector can filter
on imports later.

CLI:
  pnpm tsx scripts/import-organized-documents.ts \\
      --port-slug <slug> \\
      --bucket-prefix "legacy-imports/" \\
      (--dry-run | --apply) [--uploaded-by <userId>]

Folds in Prettier post-hook drift on documents.service.ts +
download handler — same lint-staged formatting the earlier commits
already absorbed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/services/documents.service.ts

@@ -307,10 +307,7 @@ async function hydrateDocumentsWithDownloadUrl(
     const filename = row.fileId ? (filenameById.get(row.fileId) ?? null) : null;
     return {
       ...row,
-      downloadUrl: buildDocumentDownloadUrl(
-        { id: row.id, folderId: row.folderId, filename },
-        tree,
-      ),
+      downloadUrl: buildDocumentDownloadUrl({ id: row.id, folderId: row.folderId, filename }, tree),
     };
   });
 }