PPI tooling has moved

The Post Pour Inspection web app now lives inside office-dash at /qc/ppi. Operators sign in there to fill rings; rings populate automatically from the OGS Zen3 database via a scheduled task on the OGS PC.

This repository now hosts the ingest tooling (ingest/) and the Zen3 schema reference. The legacy XLSX generator and v2 SPA were removed; their last working state lives in git history before the claude/automate-ppi-pipeline-X1EcF branch.