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/actions/auth.ts

@@ -0,0 +1,105 @@
+"use server"
+
+import { redirect } from "next/navigation"
+import { headers } from "next/headers"
+import { APIError } from "better-auth/api"
+import { auth } from "@/lib/auth"
+
+const APP_URL = process.env.NEXT_PUBLIC_APP_URL ?? "http://localhost:3000"
+
+export async function signUp(formData: FormData) {
+  const email = formData.get("email") as string
+  const password = formData.get("password") as string
+  const fullName = formData.get("full_name") as string
+
+  try {
+    await auth.api.signUpEmail({
+      body: { email, password, name: fullName },
+      headers: await headers(),
+    })
+  } catch (e) {
+    const msg = e instanceof APIError ? e.message : "Sign up failed"
+    redirect(`/signup?error=${encodeURIComponent(msg)}`)
+  }
+
+  redirect("/dashboard")
+}
+
+export async function signIn(formData: FormData) {
+  const email = formData.get("email") as string
+  const password = formData.get("password") as string
+
+  try {
+    await auth.api.signInEmail({
+      body: { email, password },
+      headers: await headers(),
+    })
+  } catch (e) {
+    const msg = e instanceof APIError ? e.message : "Invalid email or password"
+    redirect(`/login?error=${encodeURIComponent(msg)}`)
+  }
+
+  redirect("/dashboard")
+}
+
+export async function signInWithGoogle() {
+  let url: string | undefined
+  try {
+    const res = await auth.api.signInSocial({
+      body: { provider: "google", callbackURL: "/dashboard" },
+      headers: await headers(),
+    })
+    url = res?.url ?? undefined
+  } catch (e) {
+    const msg = e instanceof APIError ? e.message : "Google sign-in failed"
+    redirect(`/login?error=${encodeURIComponent(msg)}`)
+  }
+
+  if (url) redirect(url)
+  redirect("/login?error=google_failed")
+}
+
+export async function resetPassword(formData: FormData) {
+  const email = formData.get("email") as string
+
+  try {
+    await auth.api.requestPasswordReset({
+      body: { email, redirectTo: `${APP_URL}/update-password` },
+      headers: await headers(),
+    })
+  } catch {
+    // Always report success so we don't reveal whether an account exists.
+  }
+
+  redirect("/forgot-password?success=email-sent")
+}
+
+export async function signOut() {
+  try {
+    await auth.api.signOut({ headers: await headers() })
+  } catch {
+    // ignore
+  }
+  redirect("/login")
+}
+
+export async function updatePassword(formData: FormData) {
+  const password = formData.get("password") as string
+  const token = formData.get("token") as string
+
+  if (!token) {
+    redirect(`/update-password?error=${encodeURIComponent("Reset link is invalid or expired.")}`)
+  }
+
+  try {
+    await auth.api.resetPassword({
+      body: { newPassword: password, token },
+      headers: await headers(),
+    })
+  } catch (e) {
+    const msg = e instanceof APIError ? e.message : "Could not update password"
+    redirect(`/update-password?error=${encodeURIComponent(msg)}&token=${encodeURIComponent(token)}`)
+  }
+
+  redirect("/login?success=password-updated")
+}