begin backend migration

[GhostOf0days]

need to migrate github actions in backend as well as deal with non-environment variable-related errors when running pnpm run build --filter backend after pnpm install at monorepo root

[Adrastopoulos]

Thanks for the effort. This is a good start. While we have the chance, we should take this opportunity to make some much-needed architectural changes. The main one is migrating from plain JSON api to TRPC, which this repo is set up for. This should be pretty simple to set up, just replace the controllers with routers.

We want to get rid of doppler and replace jest with vite. But this is a good start.

[Adrastopoulos]

Made all the schemas. Couple of things needed:

1. Extract all relations to a relations function, similar to the auth.ts schema
2. Make all primary keys varchars instead of serial, similar to the auth.ts schema
3. Add createdAt and updatedAt on all schemas.