fix: refactor use natives to drop md5-file and multistream

[ferhatelmas]

What kind of change does this PR introduce?

Refactor

What is the current behavior?

Using three dependencies for file-backend (md5-file, multistream and its types).

What is the new behavior?

They can be replaced with their native counterparts (crypto.createHash and Readable.from).

Additional context

Less dependencies, less surface.

[coderabbitai]

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ℹ️ Recent review info

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Run ID: fe0b2cd6-c8fb-4025-87e0-57480f5875bf

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Reviewing files that changed from the base of the PR and between feb370c and 9e34653.

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📒 Files selected for processing (2)

• package.json
• src/storage/backend/file.ts

💤 Files with no reviewable changes (1)

• package.json

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Removed two runtime dependencies and replaced their functionality with internal implementations.
  • Consolidated streaming and checksum handling into a unified internal flow.
  • Updated multipart upload internals to use the new helpers.
  • No changes to public APIs or end-user behavior.

Walkthrough

This PR removes runtime dependencies "md5-file" and "multistream" from the file storage backend by internalizing MD5 hashing and multipart stream merging. It adds private helpers computeMd5, iteratePartChunks, and mergePartStreams, replaces external calls with these helpers, and updates multipart upload flows to pass the produced multipart stream and computed ETag. No exported/public API signatures changed.

Sequence Diagram(s)

sequenceDiagram
    actor Client
    participant StorageBackend
    participant FileSystem
    participant Crypto
    participant UploadService
    participant ObjectStore

    Client->>StorageBackend: Request multipart upload (finalParts)
    StorageBackend->>FileSystem: Open part files (create ReadStreams)
    StorageBackend->>Crypto: computeMd5(partPath) for ETag
    Crypto-->>StorageBackend: MD5 hash
    StorageBackend->>StorageBackend: mergePartStreams(finalParts) -> multipartStream
    StorageBackend->>UploadService: uploadObject(name, multipartStream, etag)
    UploadService->>ObjectStore: stream data -> store object
    ObjectStore-->>UploadService: upload result
    UploadService-->>StorageBackend: upload result
    StorageBackend-->>Client: Finalize response

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