feat: add Statistics Finland (finland-stat) and Statistics Poland (poland-gus)

firstdata/sources/countries/europe/finland/finland-stat.json

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+{
+  "id": "finland-stat",
+  "name": {
+    "en": "Statistics Finland",
+    "zh": "芬兰统计局",
+    "native": "Tilastokeskus"
+  },
+  "description": {
+    "en": "Statistics Finland is the national statistical institute of Finland, providing official statistics on the economy, population, society, and environment. It operates the StatFin database offering comprehensive time series data across all major statistical domains.",
+    "zh": "芬兰统计局是芬兰国家统计机构，提供经济、人口、社会和环境方面的官方统计数据。其StatFin数据库提供涵盖所有主要统计领域的综合时间序列数据。"
+  },
+  "website": "https://stat.fi/en/",
+  "data_url": "https://pxdata.stat.fi/PxWeb/pxweb/en/StatFin/",
+  "api_url": "https://pxdata.stat.fi/PxWeb/api/v1/en/StatFin/",
+  "authority_level": "government",
+  "country": "FI",
+  "domains": ["economics", "population", "society", "environment", "labor"],
+  "geographic_scope": "national",
+  "update_frequency": "annual",
+  "tags": [
+    "Finland", "Statistics Finland", "Tilastokeskus", "StatFin",
+    "芬兰", "芬兰统计局", "北欧统计", "GDP", "人口", "就业",
+    "Nordic", "official statistics", "PxWeb", "economy", "census"
+  ],
+  "data_content": {
+    "en": [
+      "National accounts and GDP",
+      "Population and demographic statistics",
+      "Labor market and employment",
+      "Prices and cost of living",
+      "Education and culture statistics",
+      "Environment and energy statistics",
+      "Foreign trade statistics",
+      "Health and social welfare data"
+    ],
+    "zh": [
+      "国民账户和GDP",
+      "人口与人口统计",
+      "劳动力市场和就业",
+      "价格和生活成本",
+      "教育和文化统计",
+      "环境和能源统计",
+      "对外贸易统计",
+      "健康和社会福利数据"
+    ]
+  }
+}

firstdata/sources/countries/europe/poland/poland-gus.json

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+{
+  "id": "poland-gus",
+  "name": {
+    "en": "Statistics Poland (GUS)",
+    "zh": "波兰中央统计局",
+    "native": "Główny Urząd Statystyczny"
+  },
+  "description": {
+    "en": "Statistics Poland (GUS — Główny Urząd Statystyczny) is the central government authority for official statistics in Poland. It provides comprehensive data on the Polish economy, society, population, and environment through its Local Data Bank (BDL) and open API.",
+    "zh": "波兰中央统计局（GUS）是波兰官方统计的中央政府机构，通过其地方数据库（BDL）和开放API提供波兰经济、社会、人口和环境的综合数据。"
+  },
+  "website": "https://stat.gov.pl/en/",
+  "data_url": "https://bdl.stat.gov.pl/BDL/start",
+  "api_url": "https://api.stat.gov.pl/Home/BdlApi",
+  "authority_level": "government",
+  "country": "PL",
+  "domains": ["economics", "population", "society", "environment", "labor"],
+  "geographic_scope": "national",
+  "update_frequency": "annual",
+  "tags": [
+    "Poland", "GUS", "Statistics Poland", "BDL", "Local Data Bank",
+    "波兰", "波兰统计局", "中东欧统计", "GDP", "人口", "就业",
+    "Central Europe", "official statistics", "open data", "economy", "census"
+  ],
+  "data_content": {
+    "en": [
+      "National accounts and GDP",
+      "Population and demographic statistics",
+      "Labor market and employment",
+      "Prices and inflation",
+      "Industrial and agricultural production",
+      "Foreign trade and balance of payments",
+      "Education and health statistics",
+      "Regional statistics by voivodeship"
+    ],
+    "zh": [
+      "国民账户和GDP",
+      "人口与人口统计",
+      "劳动力市场和就业",
+      "价格与通货膨胀",
+      "工业和农业生产",
+      "对外贸易和国际收支",
+      "教育和卫生统计",
+      "按省份划分的区域统计"
+    ]
+  }
+}