Consolidate audit-fixes branch: webhooks, integrations, and deploy hardening

Batch commit of the pending working tree on security/audit-fixes-2026-07.
Major areas:
- Outbound webhooks / Zapier: schema + signed delivery with retries, public
  v1 API (REST-hook subscribe/unsubscribe), settings UI, cron drain.
- Deploy hardening: email via SMTP2GO (Resend fully removed), verified DB TLS
  (DATABASE_SSL=require + DATABASE_CA), storage fails loud in production when
  Spaces is unconfigured instead of silently using ephemeral disk.
- Integrations & features (concurrent work): accounting (QuickBooks/Xero),
  e-signature (DocuSign/Dropbox Sign), PayPal, geocoding/maps, onboarding,
  expanded legal pages.
- DB migrations 0006–0009.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

components/marketing/features.tsx

@@ -72,7 +72,7 @@ const BENTO = [
   {
     icon: Shield,
     title: "Secure by Default",
-    body: "Row-level security on every table. Tenants only see their own data — always.",
+    body: "Every request is authenticated and scoped to your account. Tenants only see their own data — always.",
     cols: "lg:col-span-1",
     gradient: "from-rose-600/25 via-rose-600/10 to-transparent",
     border: "border-rose-500/30",