Transform crate into Cargo workspace with individual `src` roots

[aeckar]

Crates and dependencies:

• core
  • translate: mixed-language compilation
• cli (command-line compiler)
  • core: core language engine
• lsp (Language Server Protocol)
  • translate: real-time code transpilation
• editor (Tauri-based standalone editor running on Monaco)
  • core: live preview
  • lsp: syntax highlighting and language features
• mgon (Malgam object notation format)
• translate (Cross-compilation actions on copy-paste)