Addon file structure

addons/crypto-tracker/
├── manifest.json
├── package.json            # optional if you bundle with npm tooling
├── dist/
│   ├── widget.js           # built client bundle entry
│   └── widget.css
├── src/
│   ├── CryptoWidget.tsx
│   └── api.ts
├── server/
│   └── routes.ts           # optional Node routes (if permitted)
└── python/
    └── service.py          # optional sidecar