fix CI SPA prerender build

vite.config.ts

@@ -5,7 +5,6 @@ import { tanstackStart } from '@tanstack/react-start/plugin/vite'
 
 import viteReact from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
-import { nitro } from 'nitro/vite'
 
 // SPA mode: auth is Bearer-token client-side (localStorage), so route guards
 // and data fetching must not run during SSR.
@@ -14,7 +13,6 @@ const config = defineConfig({
   plugins: [
     devtools(),
     tanstackStart({ spa: { enabled: true } }),
-    nitro({ rollupConfig: { external: [/^@sentry\//] } }),
     tailwindcss(),
     viteReact(),
   ],