curl --request GET \
  --url https://app.solya.app/api/planning-periods \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "endDate": "2025-12-31",
      "id": "period-uuid-1",
      "isActive": false,
      "name": "FY2025 Budget",
      "startDate": "2025-01-01"
    },
    {
      "endDate": "2026-12-31",
      "id": "period-uuid-2",
      "isActive": true,
      "name": "FY2026 Budget",
      "startDate": "2026-01-01"
    }
  ],
  "total": 2
}