Gitea #3: harden Datenschutz for the now-public site. Adds a blocking
first-pet-onboarding step (two checkboxes) confirming the owner holds
rights to uploaded photos/videos and consents to data transfer to
Clerk/Cloudflare/Mux/Supabase. Consent timestamps are stored separately
on Owner so either declaration can be re-requested independently later.
Also documents GlitchTip as a processor and adds an explicit consent
section to the Datenschutzerklärung.
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