feat(settings): restructure settings layout and separate route modules

app/(dashboard)/settings/security/page.tsx

@@ -0,0 +1,7 @@
+import { requireFreelancerBackend } from "@/server/web/freelancer";
+import { SecuritySettingsForm } from "./security-settings-form";
+
+export default async function SecuritySettingsPage() {
+  await requireFreelancerBackend();
+  return <SecuritySettingsForm />;
+}