Modify the SmallBodyApiGateway to handle client-side specific request construction

## Description
Modify the SmallBodyApiGateway to be geared towards sending details of the request to be handled by the server.

## Acceptance
- Maintains all pre-existing behavior to gather the required data for the endpoints
- Maintains previous transformations of information.

## Implementation
- [ ] Fully construct the apiUri before being passed into the server.js
- [ ] Test locally changes

Start with the SmallBodyApiGateway and the server.js handoff described in the issue. Trace how endpoint data is gathered and transformed, then verify that the complete apiUri is passed to server.js while all existing behavior and transformations remain unchanged; test the changes locally.

Written by the indexing model from the issue text.