feat(web): /machine dev-box page with status, terminal, and home file browser

apps/next/src/app/(app)/machine/page.tsx

@@ -0,0 +1,5 @@
+import { MachineShell } from '@/components/machine/machine-shell';
+
+const MachinePage = () => <MachineShell />;
+
+export default MachinePage;