List subscriptions

curl --request GET \
  --url https://api.suby.fi/api/subscription \
  --header 'X-Suby-Api-Key: <api-key>'

{
  "success": true,
  "data": {
    "data": [
      {
        "id": "sub_abc123",
        "productId": "<string>",
        "productName": "<string>",
        "status": "ACTIVE",
        "customerEmail": "jsmith@example.com",
        "createdAt": "2023-11-07T05:31:56Z",
        "expiresAt": "2023-11-07T05:31:56Z"
      }
    ],
    "pagination": {
      "page": 1,
      "limit": 25,
      "total": 42,
      "totalPages": 2
    }
  }
}