Set up route splitting V1/V2 API

[bitbeckers]

Now that we have a V1 and V2, we need to make sure our backend supports both untill we deprecate and have sunsetted the V1 API.

The plan:

• Introduce router like NGINX or Traefik (repo: https://github.com/hypercerts-org/hypercerts-nginx-server)
• Create V1 release in repo for hotfixes; separate branch
• Create V2 release in repo for.. well V2
• Set up V1 and V2 instance in Railway
• Deploy router
• Test everything on staging
• Repeat for production