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)/properties/[propertyId]/units/[unitId]/edit/page.tsx

@@ -0,0 +1,44 @@
+import { redirect } from "next/navigation"
+import { and, eq } from "drizzle-orm"
+import { db } from "@/lib/db"
+import { properties, units } from "@/lib/db/schema"
+import { getSessionUser } from "@/lib/session"
+import { getEffectiveOwnerId } from "@/lib/account"
+import { BackButton } from "@/components/ui/back-button"
+import { UnitForm } from "@/components/forms/unit-form"
+
+export const metadata = { title: "Edit Unit" }
+
+export default async function EditUnitPage({ params }: { params: Promise<{ propertyId: string; unitId: string }> }) {
+  const user = await getSessionUser()
+  if (!user) redirect("/login")
+
+  const ownerId = await getEffectiveOwnerId(user.id)
+
+  const { propertyId, unitId } = await params
+
+  const [property, unit] = await Promise.all([
+    db.query.properties.findFirst({
+      where: and(eq(properties.id, propertyId), eq(properties.user_id, ownerId)),
+      columns: { id: true, name: true },
+    }),
+    db.query.units.findFirst({
+      where: and(eq(units.id, unitId), eq(units.property_id, propertyId), eq(units.user_id, ownerId)),
+    }),
+  ])
+
+  if (!property || !unit) redirect(`/properties/${propertyId}`)
+
+  return (
+    <div className="mx-auto max-w-2xl space-y-6">
+      <BackButton href={`/properties/${propertyId}`} />
+      <div>
+        <h2 className="text-lg font-semibold text-white">Edit Unit {unit.unit_number}</h2>
+        <p className="text-sm text-white/40">{property.name}</p>
+      </div>
+      <div className="rounded-xl border border-white/[0.06] bg-[#16161f] p-6">
+        <UnitForm propertyId={propertyId} unit={unit} />
+      </div>
+    </div>
+  )
+}