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/activity/route.ts

@@ -0,0 +1,26 @@
+import { NextResponse } from "next/server"
+import { desc, eq } from "drizzle-orm"
+import { db } from "@/lib/db"
+import { activity_log } from "@/lib/db/schema"
+import { getSessionUser } from "@/lib/session"
+
+export async function GET(request: Request) {
+  const user = await getSessionUser()
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+
+  const { searchParams } = new URL(request.url)
+  const limit = Math.min(100, parseInt(searchParams.get("limit") ?? "50", 10))
+
+  try {
+    const data = await db
+      .select()
+      .from(activity_log)
+      .where(eq(activity_log.user_id, user.id))
+      .orderBy(desc(activity_log.created_at))
+      .limit(limit)
+
+    return NextResponse.json(data)
+  } catch (e) {
+    return NextResponse.json({ error: (e as Error).message }, { status: 500 })
+  }
+}