Ministry Name Changes- Create a Centralized Constant

**Acceptance Criteria**
Create a **centralized constant** so that if a name change is required ( EG- AEST to PSFS) then it doesn't have to be changed all over the place just at the source

**Question**
a lot of our environments behind the scenes have AEST... is it important to change these route names for IMB?

Start by searching the repository for AEST and the existing ministry-name references to identify where the value is duplicated. Confirm whether route names used by IMB should change, then centralize the approved name and update its consumers; done means the name has one source of truth and the route-name decision is documented.

Written by the indexing model from the issue text.