Initial commit: thbd-portal, duplicated from elmi-portal

Rebranded for Thunderbird Portal (THBD): numbering prefix EL->TH, all
"ELMI"/"ЭЛМИ" UI strings genericized, ELMI's real contract templates and
company legal/bank details removed (not applicable to this company), fresh
VAPID keypair and encryption key, fresh single-migration schema history.
Same architecture as elmi-portal: Web Push notifications, unread-chat app
badge, cookie-session auth.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gh2UXUQUVBWroWEnn1FLFG

src/app/(admin)/settings/email/page.tsx

@@ -0,0 +1,22 @@
+import { redirect } from "next/navigation";
+import { getCurrentSession } from "@/lib/auth/session";
+import { getMailboxStatus } from "@/lib/mail/config";
+import { MailboxForm } from "./mailbox-form";
+
+export default async function EmailSettingsPage() {
+  const session = await getCurrentSession();
+  if (!session) redirect("/orders");
+
+  const status = await getMailboxStatus();
+
+  return (
+    <div>
+      <h1 className="mb-1 font-display text-xl font-bold tracking-tight">Почта</h1>
+      <p className="mb-5 text-sm text-text-muted">
+        Входящие письма распознаются через Claude в черновики запросов — менеджер подтверждает их на странице{" "}
+        «Запросы» перед созданием настоящего запроса.
+      </p>
+      <MailboxForm status={status} />
+    </div>
+  );
+}