Create example for Vue3 + Robyn with Docker multistage

[nicoschmdt]

No description provided.

[patrickelectric]

Some changes to make the PR better.

• It would be nice to move the python files to a backend folder and the html generation part to a frontend folder. At the moment all files are in the root, mixing back and frontend.
• The register_service file should exist under a public folder in the frontend folder to automatically be moved to the dist folder.
  • As consequence, robyn only needs a single endpoint to dist

The structure would be something like:

├── backend
│   ├── main.py
│   ├── pyproject.toml
│   └── uv.lock
├── Dockerfile
├── frontend
│   ├── bun.lock
│   ├── index.html
│   ├── package.json
│   ├── public
│   │   └── register_service
│   ├── src
│   │   ├── App.vue
│   │   ├── assets
│   │   │   ├── base.css
│   │   │   └── main.css
│   │   └── main.js
│   └── vite.config.js
└── README.md