feat: add Statistics Austria and Statistics Denmark

[firstdata-dev]

Summary

Adds two new European national statistical offices:

1. austria-statistik — Statistics Austria (Statistik Austria)

• Website: https://www.statistik.at
• Data URL: https://www.statistik.at/statistiken
• API: https://api.statistik.at/stat/rest/v1/
• Domains: demographics, economics, social, employment, prices
• Coverage: Population, GDP, national accounts, employment, CPI, housing, education, health

2. denmark-dst — Statistics Denmark (Danmarks Statistik)

• Website: https://www.dst.dk
• Data URL: https://www.dst.dk/en/Statistik
• API: https://api.statbank.dk/v1/ (StatBank API)
• Domains: demographics, economics, trade, social, employment, prices
• Coverage: Population, GDP, foreign trade, labor market, CPI, business, social conditions

Checklist

• All URLs verified accessible
• make check passes (158 unique IDs, schema valid, domains consistent)
• country field correctly set (AT / DK)
• geographic_scope: national
• IDs not present in existing index
• Tags include both English and Chinese keywords
• File paths follow placement rules: countries/europe/at/ and countries/europe/dk/

[firstdata-dev]

✅ LGTM. 两个欧洲统计局都有 API，schema 完整，PR 描述干净。建议合并。

[mingcha-dev]

🔍 明察 QA — PR #65

austria-statistik ✅

• HTTPS ✅, REST API ✅
• AT, government, national ✅

denmark-dst ✅

• HTTPS ✅, StatBank API ✅
• DK, government, national ✅

两个欧洲统计局，都有开放 API。LGTM 👍

[mingcha-dev]

🔍 明察 QA — PR #65

URL 验证

数据源	website	data_url	api_url
austria-statistik	✅ 200	✅ 200	⚠️ 代理阻断(198.18.0.x)
denmark-dst	✅ 200	✅ 200	✅ 200 (POST /v1/tables)

备注

• austria api.statistik.at 被本地代理拦截（198.18.0.200），非 URL 本身问题
• denmark api.statbank.dk GET /v1/ 返回 404，但 POST /v1/tables 返回 200 — 这是 POST-only API，正常
• ✅ Schema 字段正确（country/geographic_scope）
• ✅ 无重复 ID

通过 ✅ 建议合并