SDK improvements

[ftheirs]

This PR addresses three main issues:

• Standardized all hex value responses to use the 0x${string} format.
• Removed the incorrect name field from the FileInfo type (the backend response does not include a name field).
• Converted the size field in backend FileInfo responses from u64 to a string to avoid precision loss.

⚠️ Breaking Changes ⚠️

Backend API Changes

• FileInfo.size field: Changed from u64 to String in JSON responses to prevent precision loss in JavaScript
  • Impact: Any direct consumers of the backend API expecting numeric size values will need to parse the string
  • Migration: Parse size field as string: parseInt(fileInfo.size) or BigInt(fileInfo.size)

SDK Type Changes

• Removed name field: Eliminated incorrect name field from StorageFileInfo interface

  • Impact: Code accessing fileInfo.name will break
  • Migration: Use fileInfo.location instead, or import FileInfo from @storagehub-sdk/core

• Hex string format: All hex fields now consistently return 0x${string} format

  • Impact: Code expecting hex without 0x prefix may break
  • Migration: This is actually a fix - no migration needed