EntryProof v1.3.0: Terms of Service page, health endpoint, and JSON-LD schema

A solo-founder due-diligence pass shipped a Terms of Service page for EntryProof and wired up `/api/cpsc/health` so uptime monitoring has something to actually check. JSON-LD structured data also shipped this release, closing a P0 finding that EntryProof was shipping zero schema markup.

Both fixes closed real gaps an external due-diligence review would have flagged immediately: a product with no Terms of Service page and no working health endpoint looks unfinished to anyone evaluating it seriously, regardless of how good the underlying readiness checker is. Neither fix changed user-facing product behavior; they closed the gap between "the product works" and "the product looks like it was built by a team that ships professionally."