Allow only authorised user to fill out setup wizard

### Epic

#1942

### Description

**As a:** FlowForge Admin

**I want to:** be able to securely deploy FF publicly

**So that:** nobody can use the setup wizard before me to create the first admin user

### Which customers would this be availble to

All Users, (CE)

### Acceptance Criteria

- [ ] Setup Wizard protected

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate