### Check for existing issues

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

### What happened?

On v1.83.10-stable, an `internal_user` who is admin of a team cannot save changes to an existing team key via the UI's Edit Settings panel. The save fails with 403:

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

This happens even when the user did not touch the Key Type field — the form always submits the current `allowed_routes` value.

The error message's suggested workaround ("use `key_type` instead") is not actionable: `UpdateKeyRequest` does not have a `key_type` field, and the UI does not send one.

### Affected versions

- v1.83.10 (and presumably the entire v1.83.7+ line where PR #25445 first shipped) - Verified still broken on `litellm_internal_staging` tip as of commit `b1fcdb671` — the strict check in `_validate_update_key_data` and the absence of `key_type` on `UpdateKeyRequest` are unchanged

### Affected user roles

`INTERNAL_USER`, team admins, `ORG_ADMIN` — anyone whose `user_role != PROXY_ADMIN`. The Greptile reviewer on PR #25445 explicitly …