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>

app/(dashboard)/settings/integrations/page.tsx

@@ -0,0 +1,39 @@
+import { redirect } from "next/navigation"
+import { getSessionUser } from "@/lib/session"
+import { getAccountContext } from "@/lib/account"
+import { listProviders, listConnections } from "@/lib/accounting"
+import { AccountingIntegrations } from "@/components/dashboard/accounting-integrations"
+
+export const metadata = { title: "Integrations" }
+export const dynamic = "force-dynamic"
+
+export default async function IntegrationsPage({
+  searchParams,
+}: {
+  searchParams: Promise<{ connected?: string; error?: string }>
+}) {
+  const user = await getSessionUser()
+  if (!user) redirect("/login")
+  const ctx = await getAccountContext(user.id)
+  const sp = await searchParams
+
+  const providers = listProviders()
+  const connections = ctx.isOwner ? await listConnections(ctx.ownerId) : []
+
+  return (
+    <div className="max-w-3xl mx-auto space-y-6">
+      <div>
+        <h2 className="text-lg font-bold text-white">Integrations</h2>
+        <p className="text-sm text-white/40 mt-0.5">
+          Connect your accounting software to automatically push rent income and expenses into your books.
+        </p>
+      </div>
+      <AccountingIntegrations
+        providers={providers}
+        connections={connections}
+        isOwner={ctx.isOwner}
+        flash={{ connected: sp.connected, error: sp.error }}
+      />
+    </div>
+  )
+}