[WIP] rewrite my musync project in rust

[Copilot]

Rewriting MuSync project in Rust

This PR will rewrite the existing Python-based MuSync CLI tool in Rust while maintaining full compatibility with the existing functionality and authentication service.

Analysis Complete

• Analyzed existing Python codebase structure
• Identified core components and dependencies
• Understood authentication flow via Flask service
• Mapped out data structures and API interactions

Implementation Plan

• Initialize Cargo project with proper dependencies
• Create core data structures (Track, Playlist, etc.)
• Implement authentication module for Flask service integration
• Create Spotify export/import modules
• Create YouTube Music export/import modules
• Implement main CLI interface with same UX
• Add fuzzy matching for track resolution
• Add error handling and progress tracking
• Test all functionality end-to-end
• Update documentation and README

Key Design Decisions:

• Keep existing JSON export/import format for compatibility
• Maintain same CLI interface (1-4 menu options)
• Continue using existing Flask authentication service
• Use Rust async/await for better performance
• Leverage Rust's type safety for more robust code

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