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/manifest.ts

@@ -0,0 +1,22 @@
+import type { MetadataRoute } from "next"
+
+export default function manifest(): MetadataRoute.Manifest {
+  return {
+    name: "Property Management Network",
+    short_name: "PMN",
+    description:
+      "Manage rental properties, tenants, rent, maintenance, and leases from one dashboard.",
+    start_url: "/",
+    display: "standalone",
+    background_color: "#09090b",
+    theme_color: "#09090b",
+    icons: [
+      {
+        src: "/logo-mark.png",
+        type: "image/png",
+        sizes: "100x100",
+        purpose: "any",
+      },
+    ],
+  }
+}