flatten app to repo root and update docker deployment for single-stack runtime

app/auth/signin/page.tsx

@@ -0,0 +1,32 @@
+'use client';
+
+import Link from 'next/link';
+import { AuthShell } from '@/components/auth/auth-shell';
+import { Button } from '@/components/ui/button';
+
+export default function SignInPage() {
+  return (
+    <AuthShell
+      title="Local Runtime Mode"
+      subtitle="Authentication is disabled in this rebuilt local-first environment."
+      footer={(
+        <>
+          Need multi-user auth later?{' '}
+          <Link href="/" className="text-[color:var(--accent)] hover:text-[color:var(--accent-strong)]">
+            Open command center
+          </Link>
+        </>
+      )}
+    >
+      <p className="text-sm text-[color:var(--terminal-muted)]">
+        Continue directly into the fiscal terminal. API routes are same-origin and task execution is fully local with OpenClaw support.
+      </p>
+
+      <Link href="/" className="mt-6 block">
+        <Button type="button" className="w-full">
+          Enter terminal
+        </Button>
+      </Link>
+    </AuthShell>
+  );
+}