Baseline the existing prototype

**Understand and document what the current prototype does before asking AI to refactor it.**

**Acceptance criteria:**
- [ ] Existing routes, filters, dashboard behaviour and CSV export are documented.
- [ ] Content API usage is documented.
- [ ] Required environment variables are identified.
- [ ] Current deployment assumptions are captured.
- [ ] Behaviour that must be preserved is clearly listed.

Start by locating the prototype's route definitions, filters, dashboard, CSV export, Content API integration, environment configuration, and deployment files. Run the existing app and record the current behavior, required variables, deployment assumptions, and behavior that must remain unchanged; done means all acceptance criteria are documented.

Written by the indexing model from the issue text.