### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

On 1.93.0, existing non-admins can no longer switch their existing keys from key type "AI APIs" to "Full access".

If I try to do it, an existing "AI APIs" keys looks like this:

<img width="263" height="171" alt="Image" src="https://github.com/user-attachments/assets/7ad87d58-4c19-4b59-9c4c-b57e9c2ff1f7" />

I switch it to Key Type full access, which automatically clears Allowed routes:

<img width="263" height="171" alt="Image" src="https://github.com/user-attachments/assets/fbbaa74a-09c8-4e6f-932f-47ca269ad6a1" />

I hit save and get the following error:

``` {'error': 'Only proxy admins can set `allowed_routes` on a key. Use `key_type` to pick a preset route bucket instead.'} ```

The error message tells me to do exactly what I'm already trying to do, switching key type to "Full access".

This is likely related to the changes mentioned in v1.92.0 release notes:

*Setting permissions and allowed_routes now requires proxy-admin privileges.*

, but it seems it was intended that non-admin users can set the key type as they like self-service. Si…