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/ui/scroll-to-top.tsx

@@ -0,0 +1,35 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import { ArrowUp } from "lucide-react"
+import { cn } from "@/lib/utils"
+
+export function ScrollToTop() {
+  const [visible, setVisible] = useState(false)
+
+  useEffect(() => {
+    // Watch the main scroll container
+    const el = document.getElementById("main-scroll")
+    if (!el) return
+    function onScroll() { setVisible(el!.scrollTop > 300) }
+    el.addEventListener("scroll", onScroll, { passive: true })
+    return () => el!.removeEventListener("scroll", onScroll)
+  }, [])
+
+  function scrollUp() {
+    document.getElementById("main-scroll")?.scrollTo({ top: 0, behavior: "smooth" })
+  }
+
+  return (
+    <button
+      onClick={scrollUp}
+      aria-label="Scroll to top"
+      className={cn(
+        "fixed bottom-6 right-6 z-50 flex h-10 w-10 items-center justify-center rounded-full border border-white/[0.1] bg-[#1d1d2a] shadow-lg shadow-black/40 text-white/50 transition-all duration-300 hover:border-indigo-500/40 hover:bg-indigo-600/20 hover:text-white",
+        visible ? "opacity-100 translate-y-0 pointer-events-auto" : "opacity-0 translate-y-4 pointer-events-none"
+      )}
+    >
+      <ArrowUp className="h-4 w-4" />
+    </button>
+  )
+}