Fix API playground not loading (#10891)

The @scalar package we use to offer a REST api playground is quite heavy
(3k files compared to the 15k existing) and is not pre-build in the npm
package, which is not unusual.

This is increasing the memory need during vite build. 
I'm increasing the RAM available for vite build.

Long term I recommend using a CDN here as this is not really a React
component so we won't benefit from any reactivity anyway. Exaclty like
we have done for FrontApp support chat integration
<img width="1058" alt="image"
src="https://github.com/user-attachments/assets/5412c6c1-7434-4b19-b9ac-e89f1cb614f3"
/>

packages/twenty-front/vite.config.ts

@@ -146,7 +146,15 @@ export default defineConfig(({ command, mode }) => {
       outDir: 'build',
       sourcemap: VITE_BUILD_SOURCEMAP === 'true',
       rollupOptions: {
-        external: ['@scalar/api-reference-react'],
+        output: {
+          manualChunks: (id: string) => {
+            if (id.includes('@scalar')) {
+              return 'scalar';
+            }
+
+            return null;
+          },
+        },
       },
     },