Add CLI client for YSTP file transfer

[deathbyknowledge]

Summary

Implement a complete Node.js CLI client for the YSTP (Your Super Transfer Program) file transfer service.

Changes

• New CLI executable (cli/ystp.mjs):

  • send command: Upload files and generate shareable mnemonic codes
  • receive command: Download files using session codes
  • Real-time progress indicators with formatted file sizes
  • Support for custom host, port, and protocol options
  • Chunked transfers (64KB) for memory efficiency
  • Comprehensive error handling and user feedback

• Updated package.json:

  • Added ws dependency for WebSocket communication
  • Added bin field to register ystp as a CLI command

Usage Examples

# Send a file (outputs shareable code for receiver)
ystp send document.pdf

# Receive a file using session code
ystp receive apple-banana-cherry-date --output ~/downloads

# Send file to remote server with SSL
ystp send file.zip --host example.com --port 443 --protocol wss

# Get help
ystp

Features

• ✓ Automatic mnemonic code generation and sharing
• ✓ Real-time progress bars showing transfer speed
• ✓ File metadata validation (name, size)
• ✓ Chunked transmission for large files
• ✓ Graceful error handling and recovery
• ✓ Support for both local and remote connections

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