Add a per-pet consent gate (Art. 9 Abs. 2 lit. a DSGVO) in front of the
whole Health-Tracking area (weight, vet visits, vaccines, emergency
vet, feeding, Health Card): an un-pre-checked checkbox must be
confirmed before any of it is used, enforced server-side in
health.ts (not just the UI) via a new assertHealthConsent check on
every data-bearing endpoint.
Revoking consent (health.revokeConsent) deletes every health record
for that pet in one transaction and is available at any time from the
Health page. Pet gains healthConsentGivenAt/healthConsentRevokedAt
(nullable, additive — db push already applied against the shared
Supabase instance).
Extends the Datenschutzerklärung (Abschnitt 3) with the Art. 9 legal
basis and the revoke/auto-delete mechanism, per counsel's follow-up.
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