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/api/rent/payment-link/route.ts

@@ -0,0 +1,41 @@
+import { NextResponse } from "next/server"
+import { and, eq } from "drizzle-orm"
+import { db } from "@/lib/db"
+import { rent_payments } from "@/lib/db/schema"
+import { getSessionUser } from "@/lib/session"
+import { createRentPaymentLink } from "@/lib/stripe/payment-links"
+
+export async function POST(request: Request) {
+  const user = await getSessionUser()
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+
+  const { payment_id } = await request.json() as { payment_id: string }
+
+  const payment = await db.query.rent_payments.findFirst({
+    where: and(eq(rent_payments.id, payment_id), eq(rent_payments.user_id, user.id)),
+    with: {
+      tenant: { columns: { first_name: true, last_name: true } },
+      property: { columns: { name: true } },
+      unit: { columns: { unit_number: true } },
+    },
+  })
+
+  if (!payment) return NextResponse.json({ error: "Payment not found" }, { status: 404 })
+
+  const link = await createRentPaymentLink({
+    tenantName: `${payment.tenant.first_name} ${payment.tenant.last_name}`,
+    propertyName: payment.property.name,
+    unitNumber: payment.unit?.unit_number ?? "—",
+    amount: payment.amount,
+    tenantId: payment.tenant_id,
+    paymentId: payment.id,
+  })
+
+  // Save link ID to payment record
+  await db
+    .update(rent_payments)
+    .set({ stripe_payment_link_id: link.id })
+    .where(and(eq(rent_payments.id, payment_id), eq(rent_payments.user_id, user.id)))
+
+  return NextResponse.json({ url: link.url })
+}