Bulk create up to 50 stories

Example request

{
  "stories": [
    {
      "projectId": "00000000-0000-0000-0000-000000000001",
      "caption": "New listing at 14B Vine Street — 3 bed, mountain views.",
      "channels": [
        "instagram",
        "facebook"
      ],
      "media_url": "https://cdn.example.com/listing.jpg",
      "scheduled_at_local": "2026-06-19T09:00:00",
      "timezone": "America/Denver"
    }
  ]
}