feat(account): self-service GDPR Art.17 erasure; Enterprise price -> Custom

Account deletion (DELETE /v1/account): re-type email/phone to confirm, stops live containers and hard-deletes every org where the caller is sole member (FK cascade clears servers, builds, logs, encrypted secrets), deletes the user (cascade drops sessions), audits the action, clears the session cookie. Frontend danger-zone replaces the old open-a-ticket placeholder. Closes audit ACC-001. Enterprise price unified to Custom on landing + pricing, removing the 499/999 inconsistency.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/web/app/(marketing)/pricing/page.tsx

@@ -65,8 +65,8 @@ const TIERS = [
   },
   {
     name: 'Enterprise',
-    price: '€999+',
-    tag: '/ month',
+    price: 'Custom',
+    tag: 'talk to us',
     description: 'For organizations with custom infrastructure, compliance and scale needs.',
     model: 'Claude AI',
     modelDetail: 'Top-tier Claude · EU data-residency option',