Rethink build/serve for Tenant UI frontend

[loneil]

TBD

The Tenant UI was developed to :

• Be served by it's Node API. This Node API also supplies some endpoints that the Tenant UI needs (SMTP functionality, OIDC login for Innkeeper, etc).
• Get it's env config from the Node API
• Build... (refresh memory here, can't remember what was thrown together originally). The Vue app is built as a static dist and that is served by the Node api on an express route.
• Startup... (same as above)

Some of this could be rethought if necessary, as the Vue app is pretty standalone at this point.

[loneil]

The FE (Vue app) could be served by some other structure (Caddy, Nginx) and the node API continue on it's own.
Not sure if that's better to have 2 servers to host and maintain rather than just having the Node app handle both purposes but think it could work.