### List subscribable event keys

`GET /api/v1/admin/webhooks/event-catalog`

Every event an endpoint may subscribe to, with its category. The create and update endpoints validate the events array against exactly this set, so read it before writing one. Static for the life of the release, so fetch it once and cache it.

- Authentication: manager session (JWT) or API token
- Permission: `prm_notifications_manage` (Manage notification channels & templates)
- Risk: write

#### Response — 200 OK

```json
{
  "data": [
    { "key": "user.created", "category": "lifecycle" },
    { "key": "user.disconnected", "category": "lifecycle" },
    { "key": "usage.threshold", "category": "usage" }
  ],
  "meta": { "page": 1, "page_size": 3, "total": 3, "has_next": false }
}
```