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Custom attribute definitions can now only be created, edited, or deleted by administrators, matching the existing settings UI restriction. Previously, an agent could call the `custom_attribute_definitions` API directly and modify account configuration that they couldn't reach through the dashboard — a Broken Access Control vulnerability reported externally. Fixes https://linear.app/chatwoot/issue/CW-7038/broken-access-control-on-custom-attribute-definitions-api ## How to test 1. Sign in as an agent. 2. Try to create a custom attribute by calling `POST /api/v1/accounts/<id>/custom_attribute_definitions` directly (the settings page is hidden for agents — use curl with the agent's `api_access_token`). 3. Expect `401 Unauthorized` with body `{"error":"You are not authorized to do this action"}`. Repeat for `PATCH` and `DELETE`. 4. Sign in as an administrator and confirm create/edit/delete still work from Settings → Custom Attributes. 5. As either role, the listing endpoint (`GET .../custom_attribute_definitions`) should still succeed — agents need this to render attributes in conversation and contact panels. Co-authored-by: Muhsin <12408980+muhsin-k@users.noreply.github.com>