[WEB-5042] feat: sites vite migration (#7965)

apps/space/react-router.config.ts

@@ -0,0 +1,8 @@
+import type { Config } from "@react-router/dev/config";
+
+export default {
+  appDirectory: "app",
+  basename: process.env.NEXT_PUBLIC_SPACE_BASE_PATH,
+  // Space runs as a client-side app; build a static client bundle only
+  ssr: false,
+} satisfies Config;