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>

components/forms/portal-button.tsx

@@ -0,0 +1,25 @@
+"use client"
+
+import { useState } from "react"
+
+export function PortalButton() {
+  const [loading, setLoading] = useState(false)
+
+  async function handleClick() {
+    setLoading(true)
+    const res = await fetch("/api/stripe/portal", { method: "POST" })
+    const data = await res.json()
+    if (data.url) window.location.href = data.url
+    else setLoading(false)
+  }
+
+  return (
+    <button
+      onClick={handleClick}
+      disabled={loading}
+      className="rounded-lg border border-white/10 px-4 py-2 text-sm text-white/60 hover:border-white/20 hover:text-white transition disabled:opacity-50"
+    >
+      {loading ? "Loading..." : "Manage Subscription"}
+    </button>
+  )
+}