fix: address review — URL accessibility notes for CDC/CNPC/Sinopec/CNOOC

- china-cdc: data_url → /gzdt/ (stable), note about /jkzt/ reorganization
- china-cnpc: note about WAF returning 412 to automated probes
- china-sinopec: data_url switched to http (https endpoint unstable from some networks)
- china-cnooc: data_url simplified to root landing (col/col6264 server-side redirect loop for non-browser clients)

All 4 files still pass schema validation.

Author: firstdata-dev

firstdata/sources/china/health/china-cdc.json

@@ -5,11 +5,11 @@
     "zh": "中国疾病预防控制中心"
   },
   "description": {
-    "en": "The Chinese Center for Disease Control and Prevention (China CDC) is the national public health institute responsible for disease prevention, surveillance, and health emergency response. It publishes infectious disease surveillance reports, chronic disease data, vaccination coverage statistics, environmental health assessments, and public health emergency bulletins.",
+    "en": "The Chinese Center for Disease Control and Prevention (China CDC) is the national public health institute responsible for disease prevention, surveillance, and health emergency response. It publishes infectious disease surveillance reports, chronic disease data, vaccination coverage statistics, environmental health assessments, and public health emergency bulletins. Some deep-link sub-sections (e.g. /jkzt/) have been reorganized; use /gzdt/ for published work announcements or en.chinacdc.cn for English portal.",
     "zh": "中国疾病预防控制中心是国家级疾病预防控制与公共卫生技术管理和服务机构，负责疾病预防控制、公共卫生监测和卫生应急处置。发布传染病疫情监测报告、慢性病数据、疫苗接种统计、环境卫生评估及突发公共卫生事件公报。"
   },
   "website": "https://www.chinacdc.cn",
-  "data_url": "https://www.chinacdc.cn/jkzt/",
+  "data_url": "https://www.chinacdc.cn/gzdt/",
   "api_url": null,
   "country": "CN",
   "domains": [

firstdata/sources/china/resources/china-cnooc.json

@@ -5,11 +5,11 @@
     "zh": "中国海洋石油集团有限公司"
   },
   "description": {
-    "en": "China National Offshore Oil Corporation (CNOOC) is China's largest offshore oil and gas producer and a central state-owned enterprise. It publishes annual reports, sustainability reports, offshore oil and gas production data, deepwater exploration results, LNG import and terminal operation statistics, and marine environmental protection reports.",
+    "en": "China National Offshore Oil Corporation (CNOOC) is China's largest offshore oil and gas producer and a central state-owned enterprise. It publishes annual reports, sustainability reports, offshore oil and gas production data, deepwater exploration results, LNG import and terminal operation statistics, and marine environmental protection reports. Note: some sub-sections use server-side redirects that loop for non-browser clients; landing page (root) is stable and lists all reports.",
     "zh": "中国海洋石油集团有限公司（中国海油）是中国最大的海上油气生产商，中央企业。发布年度报告、可持续发展报告、海上油气产量数据、深水勘探成果、LNG进口及接收站运营统计和海洋环境保护报告。"
   },
   "website": "https://www.cnooc.com.cn",
-  "data_url": "https://www.cnooc.com.cn/col/col6264/index.html",
+  "data_url": "https://www.cnooc.com.cn",
   "api_url": null,
   "country": "CN",
   "domains": [

firstdata/sources/china/resources/china-cnpc.json

@@ -5,7 +5,7 @@
     "zh": "中国石油天然气集团有限公司"
   },
   "description": {
-    "en": "China National Petroleum Corporation (CNPC) is the largest state-owned oil and gas company in China and one of the world's largest energy companies. It publishes annual reports, sustainability reports, oil and gas production statistics, reserves data, and energy market analyses covering crude oil, natural gas, refining, and petrochemical operations.",
+    "en": "China National Petroleum Corporation (CNPC) is the largest state-owned oil and gas company in China and one of the world's largest energy companies. It publishes annual reports, sustainability reports, oil and gas production statistics, reserves data, and energy market analyses covering crude oil, natural gas, refining, and petrochemical operations. Note: site is behind a WAF and may return HTTP 412 to automated requests; content accessible via standard browsers.",
     "zh": "中国石油天然气集团有限公司（中国石油）是中国最大的国有油气企业，也是全球最大的能源企业之一。发布年度报告、可持续发展报告、油气产量统计、储量数据及能源市场分析，涵盖原油、天然气、炼化及石化业务。"
   },
   "website": "https://www.cnpc.com.cn",

firstdata/sources/china/resources/china-sinopec.json

@@ -5,11 +5,11 @@
     "zh": "中国石油化工集团有限公司"
   },
   "description": {
-    "en": "China Petrochemical Corporation (Sinopec Group) is one of the world's largest integrated energy and chemical companies and a central state-owned enterprise of China. It publishes annual reports, sustainability reports, refining and chemical production statistics, oil and gas exploration data, and energy transition progress reports covering upstream, midstream, and downstream operations.",
+    "en": "China Petrochemical Corporation (Sinopec Group) is one of the world's largest integrated energy and chemical companies and a central state-owned enterprise of China. It publishes annual reports, sustainability reports, refining and chemical production statistics, oil and gas exploration data, and energy transition progress reports covering upstream, midstream, and downstream operations. Note: HTTPS endpoint is not reliably reachable from some networks; HTTP works.",
     "zh": "中国石油化工集团有限公司（中国石化）是全球最大的综合性能源化工企业之一，中国中央企业。发布年度报告、可持续发展报告、炼化生产统计、油气勘探数据及能源转型进展报告，涵盖上游、中游和下游业务。"
   },
-  "website": "https://www.sinopecgroup.com",
-  "data_url": "https://www.sinopecgroup.com/group/xhtml/shzr/",
+  "website": "http://www.sinopecgroup.com",
+  "data_url": "http://www.sinopecgroup.com/group/xhtml/shzr/",
   "api_url": null,
   "country": "CN",
   "domains": [