GET /estonian-stats/categories
列出爱沙尼亚统计局 (Statistikaamet) 所有顶级统计分类：环境、经济、人口、社会生活、多领域统计等。
curl https://nordapi.ee/api/v1/estonian-stats/categories
{
"data": [
{
"id": "keskkond",
"text": "Environment",
"type": "l"
},
{
"id": "majandus",
"text": "Economy",
"type": "l"
},
{
"id": "rahvastik",
"text": "Population",
"type": "l"
},
{
"id": "sotsiaalelu",
"text": "Social life",
"type": "l"
},
{
"id": "eri-valdkondade-statistika",
"text": "Multidomain statistics",
"type": "l"
},
{
"id": "rahvaloendus",
"text": "Population and Housing Census",
"type": "l"
},
{
"id": "Lepetatud_tabelid",
"text": "Discontinued datasets",
"type": "l"
}
],
"success": true
}