Get trust store configuration

Example response

{
  "id": "669b23ed-7dc9-451d-82c6-b65f49cb1a9a",
  "provider": "http",
  "refresh_interval": 60,
  "created_at": "2025-09-23T12:40:34Z",
  "updated_at": "2025-09-23T12:40:34Z",
  "url": "https://trust-store.example.com/certs",
  "cacertfile": "-----BEGIN CERTIFICATE-----\n...\n-----END CERTIFICATE-----"
}