List distribution channels

{
    "id": "ch1a2b3c-d4e5-6789-abcd-ef1234567890",
    "name": "Website",
    "slug": "website",
    "description": "Main website distribution",
    "url": "https://dagbooks.org",
    "sortOrder": 0,
    "isActive": 1,
    "createdAt": "2026-01-15T00:00:00.000Z"
}