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/opengraph-image.tsx

@@ -0,0 +1,85 @@
+import { ImageResponse } from "next/og"
+
+export const alt = "Property Management Network — property management without the chaos"
+export const size = { width: 1200, height: 630 }
+export const contentType = "image/png"
+
+export default function OpengraphImage() {
+  return new ImageResponse(
+    (
+      <div
+        style={{
+          display: "flex",
+          flexDirection: "column",
+          justifyContent: "center",
+          width: "100%",
+          height: "100%",
+          padding: "80px",
+          background: "#09090b",
+          backgroundImage:
+            "radial-gradient(1000px circle at 30% 0%, rgba(99, 102, 241, 0.28), rgba(9, 9, 11, 0) 55%), radial-gradient(900px circle at 90% 100%, rgba(139, 92, 246, 0.18), rgba(9, 9, 11, 0) 55%)",
+          color: "white",
+          fontFamily: "sans-serif",
+        }}
+      >
+        <div
+          style={{
+            display: "flex",
+            alignItems: "center",
+            gap: "14px",
+            marginBottom: "44px",
+          }}
+        >
+          <div
+            style={{
+              display: "flex",
+              width: "16px",
+              height: "16px",
+              borderRadius: "9999px",
+              background: "#6366f1",
+            }}
+          />
+          <div
+            style={{
+              fontSize: "26px",
+              fontWeight: 600,
+              letterSpacing: "0.02em",
+              color: "rgba(255, 255, 255, 0.9)",
+            }}
+          >
+            Property Management Network
+          </div>
+        </div>
+
+        <div
+          style={{
+            display: "flex",
+            fontSize: "84px",
+            fontWeight: 800,
+            lineHeight: 1.05,
+            letterSpacing: "-0.02em",
+            maxWidth: "980px",
+          }}
+        >
+          Property management without the chaos
+        </div>
+
+        <div
+          style={{
+            display: "flex",
+            marginTop: "36px",
+            fontSize: "32px",
+            fontWeight: 400,
+            lineHeight: 1.35,
+            color: "rgba(255, 255, 255, 0.6)",
+            maxWidth: "900px",
+          }}
+        >
+          Track rent, maintenance, leases &amp; expenses — built for independent
+          landlords.
+        </div>
+      </div>
+    ),
+    { ...size },
+  )
+}