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

app/auth/signup/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 SignUpPage() {
+  return (
+    <AuthShell
+      title="Workspace Provisioned"
+      subtitle="This clone now runs in local-operator mode and does not require account creation."
+      footer={(
+        <>
+          Already set?{' '}
+          <Link href="/" className="text-[color:var(--accent)] hover:text-[color:var(--accent-strong)]">
+            Launch dashboard
+          </Link>
+        </>
+      )}
+    >
+      <p className="text-sm text-[color:var(--terminal-muted)]">
+        For production deployment you can reintroduce full multi-user authentication, but this rebuild is intentionally self-contained for fast iteration.
+      </p>
+
+      <Link href="/" className="mt-6 block">
+        <Button type="button" className="w-full">
+          Open fiscal desk
+        </Button>
+      </Link>
+    </AuthShell>
+  );
+}