Lister les invitations

{
  "data": [
    {
      "id": "inv_123xyz",
      "role": "member",
      "email": "newuser@example.com",
      "created_at": "2026-01-15T10:30:00Z",
      "expires_at": "2026-02-14T10:30:00Z",
      "invited_by": "usr_456def",
      "revoked_at": null,
      "accepted_at": null
    }
  ],
  "object": "list"
}