List shares

curl https://api.craftkit.dev/v1/renders/$RENDER_ID/shares \
  -H "Authorization: Bearer $CRAFTKIT_API_KEY"

{
  "shares": [
    {
      "id": "…",
      "channel": "link",
      "recipientEmail": null,
      "message": "Here is your signed agreement.",
      "revokedAt": null,
      "revokedReason": null,
      "expiresAt": "2026-12-31T23:59:59.000Z",
      "createdAt": "2026-06-05T10:05:00.000Z",
      "shareToken": "cks_…",
      "clickCount": 3,
      "shareUrl": "https://www.craftkit.dev/share/cks_…"
    }
  ]
}