Is your feature request related to a problem? Please describe.
Users can't access the playground, they get redirected back to /.
That happens because of this line:
https://github.com/open-webui/open-webui/blob/main/src/lib/components/playground/Playground.svelte#L215

Describe the solution you'd like
Allow users to access the playground.

Describe alternatives you've considered

• Option 1 - By removing condition mentioned in the code above
• Option 2 - By setting a toggle in Admin menu that permits users to access the playground
• Option 3 - Any other alternative you prefer

I would like to better understand the reasoning behind the current implementation