[backend] The backend example is not connection scoped

[kittaakos]

If I open multiple browser windows, the client gets overridden on the backend service implementation.

The backend example either has to maintain an array of connected clients (and should remove the client on browser windows close), or the service should be connection scoped so that each frontend gets its service instance.

[JonasHelming]

Thank you for the report, I agree! Are you interested in a contribution to fix this?

[kittaakos]

Sure. Please assign it to me. Thank you!