Initial import: property management SaaS + security hardening + admin dashboard

Property Management Network — Next.js 16 (App Router), Better Auth,
Drizzle ORM over PostgreSQL, Stripe, OpenAI, Resend.

Includes:
- Security hardening: access-control/IDOR fixes, TLS-by-default DB layer,
  constant-time cron auth, strict security headers, atomic AI quota gating,
  HTML/email output encoding, demo-backdoor disabled in production.
- Superadmin dashboard at /admin (overview/MRR, server-paginated users with
  ban/impersonate/plan/delete, billing, platform activity + admin audit log,
  AI usage, system health) via the Better Auth admin plugin.
- Seed/migration utility scripts under scripts/.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/(auth)/layout.tsx

@@ -0,0 +1,13 @@
+import type { Metadata } from "next"
+
+export const metadata: Metadata = {
+  title: "Sign in to Property Management Network",
+}
+
+export default function AuthLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-[#09090b] px-4">
+      <div className="w-full max-w-md">{children}</div>
+    </div>
+  )
+}