- Root package.json with npm run dev (concurrently API + Vite)
- Add node_modules/, frontend/dist/ to .gitignore
- Whitelist package.json and package-lock.json
- Move all scripts (p2pk, p2pkh, p2sh, p2wpkh, p2tr) into src/
- Rename main.py to __main__.py to allow running with `python .`
- Update script paths in __main__.py
- Translate README to English and update launch instructions
- Add __pycache__, *.pyc, *.json to .gitignore