Utopia backend needs to route each user to the corresponding node (defined by the current Stack)

[jorgeantonio21]

Feature Request

When a user interacts with the chat application, it does so via its own Stack. Once the user authenticates on the UI, the backend needs to fetch the right node, and send post requests for inference.

Alternative approach: The Stacks are bought by the Utopia's backend, on demand, and are do not belong to the user.

We can have a hybrid approach, where Web3 users can have their own Stacks and Web2 users don't.