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feat(storage): add TUS resumable uploads, background downloads, and multipart upload engine (#988)

* docs: add storage background transfers design spec

Covers TUS resumable uploads, background URLSession downloads,
StorageTransferTask<Success> public API, error handling, and test plan.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* docs: add storage background transfers implementation plan

9-task TDD plan covering StorageTransferTask types, TUSUploadEngine,
DownloadSessionDelegate, StorageFileAPI wiring, and integration tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat(storage): add StorageTransferTask, TransferEvent, TransferProgress types

Introduces core transfer infrastructure: StorageTransferTask<Success> generic
handle with events stream and async result, TransferEvent and TransferProgress
value types, mapResult transformation, StorageErrorCode/StorageError extensions
for networkError, fileSystemError, and cancelled, and typed aliases
StorageUploadTask and StorageDownloadTask.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(storage): fix mapResult bridge Task leak, add missing tests

Store the bridge Task in mapResult and cancel it when the returned task
is cancelled to prevent the loop from leaking. Add terminal doc comment
to .completed, and add tests for cancel closure invocation and transform
error propagation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat(storage): add backgroundDownloadSessionIdentifier config + download session setup

Adds `backgroundDownloadSessionIdentifier` to `StorageClientConfiguration`,
creates a stub `DownloadSessionDelegate`, and wires a `URLSession` download
session (foreground or background) into `StorageClient` with a
`handleBackgroundEvents(forSessionIdentifier:completionHandler:)` entry point.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat(storage): add TUSUploadEngine with POST create and PATCH chunk loop

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