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/client.ts

@@ -0,0 +1,27 @@
+import Stripe from "stripe"
+
+// Lazily construct the Stripe client so `next build` (which evaluates route
+// modules to collect page data) does NOT require STRIPE_SECRET_KEY. The key is
+// only needed at runtime. Call sites keep using `stripe.xxx` unchanged — the
+// Proxy builds the real client on first property access.
+let _stripe: Stripe | null = null
+
+function getStripe(): Stripe {
+  if (!_stripe) {
+    const key = process.env.STRIPE_SECRET_KEY
+    if (!key) throw new Error("STRIPE_SECRET_KEY is not set")
+    _stripe = new Stripe(key, {
+      apiVersion: "2025-03-31.basil",
+      typescript: true,
+    })
+  }
+  return _stripe
+}
+
+export const stripe = new Proxy({} as Stripe, {
+  get(_target, prop, receiver) {
+    const client = getStripe()
+    const value = Reflect.get(client, prop, receiver)
+    return typeof value === "function" ? value.bind(client) : value
+  },
+})

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
+}

lib/stripe/plans.ts

@@ -0,0 +1,77 @@
+import type { Plan, PlanLimits } from "@/types"
+
+export const PLAN_LIMITS: Record<Plan, PlanLimits> = {
+  starter: {
+    maxProperties: 1,
+    maxTenants: 3,
+    maxAiCalls: 0,
+    maxStorageMB: 100,
+    hasTeamAccess: false,
+    hasWhiteLabel: false,
+  },
+  pro: {
+    maxProperties: 10,
+    maxTenants: Infinity,
+    maxAiCalls: 50,
+    maxStorageMB: 5120,
+    hasTeamAccess: false,
+    hasWhiteLabel: false,
+  },
+  landlord: {
+    maxProperties: Infinity,
+    maxTenants: Infinity,
+    maxAiCalls: 200,
+    maxStorageMB: 25600,
+    hasTeamAccess: true,
+    hasWhiteLabel: true,
+  },
+  lifetime: {
+    maxProperties: Infinity,
+    maxTenants: Infinity,
+    maxAiCalls: 200,
+    maxStorageMB: 25600,
+    hasTeamAccess: true,
+    hasWhiteLabel: true,
+  },
+}
+
+export const PLAN_PRICES: Record<string, { plan: Plan; priceId: string; amount: number; interval: string }> = {
+  pro: {
+    plan: "pro",
+    priceId: process.env.STRIPE_PRO_MONTHLY_PRICE_ID!,
+    amount: 29,
+    interval: "month",
+  },
+  landlord: {
+    plan: "landlord",
+    priceId: process.env.STRIPE_LANDLORD_MONTHLY_PRICE_ID!,
+    amount: 59,
+    interval: "month",
+  },
+  lifetime: {
+    plan: "lifetime",
+    priceId: process.env.STRIPE_LIFETIME_PRICE_ID!,
+    amount: 199,
+    interval: "one_time",
+  },
+}
+
+export function checkLimit(
+  plan: Plan,
+  resource: keyof PlanLimits,
+  currentCount: number
+): boolean {
+  const limit = PLAN_LIMITS[plan][resource]
+  if (typeof limit === "boolean") return limit
+  return currentCount < (limit as number)
+}
+
+export function getPlanLabel(plan: Plan): string {
+  const labels: Record<Plan, string> = {
+    starter: "Starter",
+    pro: "Pro",
+    landlord: "Landlord",
+    lifetime: "Lifetime",
+  }
+  return labels[plan]
+}