Listening calendar

curl --request GET \
  --url https://api.rewind.rest/v1/listening/calendar \
  --header 'Authorization: Bearer <token>'

{
  "year": 2026,
  "days": [
    {
      "date": "2026-03-01",
      "count": 15
    },
    {
      "date": "2026-03-02",
      "count": 22
    },
    {
      "date": "2026-03-03",
      "count": 8
    }
  ],
  "total": 45,
  "max_day": {
    "date": "2026-03-02",
    "count": 22
  }
}