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>

lib/stripe/payment-links.ts

@@ -0,0 +1,46 @@
+import { stripe } from "./client"
+
+export async function createRentPaymentLink({
+  tenantName,
+  propertyName,
+  unitNumber,
+  amount,
+  tenantId,
+  paymentId,
+}: {
+  tenantName: string
+  propertyName: string
+  unitNumber: string
+  amount: number
+  tenantId: string
+  paymentId: string
+}) {
+  const paymentLink = await stripe.paymentLinks.create({
+    line_items: [
+      {
+        price_data: {
+          currency: "usd",
+          unit_amount: Math.round(amount * 100),
+          product_data: {
+            name: `Rent Payment — ${propertyName} Unit ${unitNumber}`,
+            description: `Tenant: ${tenantName}`,
+          },
+        },
+        quantity: 1,
+      },
+    ],
+    metadata: {
+      tenant_id: tenantId,
+      payment_id: paymentId,
+      type: "rent_payment",
+    },
+    after_completion: {
+      type: "redirect",
+      redirect: {
+        url: `${process.env.NEXT_PUBLIC_APP_URL}/tenant-portal/payment-success`,
+      },
+    },
+  })
+
+  return paymentLink
+}