AI Gateway: Authentication Error - No Auth Credentials Found in Universal Endpoint

### Description
The universal endpoint in the AI Gateway is returning a "No auth credentials found" error when requests are made with proper authentication.

### Steps to Reproduce
1. Make a request to the AI Gateway's universal endpoint
2. Omit or provide valid authentication credentials
3. Observe the 401 Unauthorized response with "No auth credentials found" message

### Expected Behavior
- The endpoint should either:
- Accept properly authenticated requests
- Return a more descriptive error message about missing authentication

### Actual Behavior
- Request fails with: `"message": "No auth credentials found"`