feat(freight:backoffice): added basic frontend integration with auth(login) page

apps/edr-freight-web/backoffice/src/pages/billing/BillingPage.tsx

@@ -0,0 +1,12 @@
+import FeaturePlaceholder from "@/components/FeaturePlaceholder";
+
+const BillingPage = () => {
+  return (
+    <FeaturePlaceholder
+      title="Billing"
+      description="Review invoice activity, billing exceptions, and reconciliation tasks for freight operations."
+    />
+  );
+};
+
+export default BillingPage;