Update Shenzhen settlement source to NOAA ZGSZ

src/data_collection/city_registry.py

@@ -451,9 +451,9 @@ CITY_REGISTRY = {
         "lat": 22.6393,
         "lon": 113.8107,
         "icao": "ZGSZ",
-        "settlement_source": "wunderground",
-        "settlement_url": "https://www.wunderground.com/weather/cn/shenzhen/ZGSZ",
-        "settlement_station_label": "Shenzhen Bao'an Intl Airport Station",
+        "settlement_source": "noaa",
+        "settlement_station_code": "ZGSZ",
+        "settlement_station_label": "Shenzhen Baoan International Airport",
         "tz_offset": 28800,
         "use_fahrenheit": False,
         "is_major": True,
@@ -461,7 +461,7 @@ CITY_REGISTRY = {
         "risk_emoji": "🟡",
         "airport_name": "深圳宝安国际机场",
         "distance_km": 32.0,
-        "warning": "近海受海洋调节，热岛效应强，日夜温差较小。",
+        "warning": "市场现按 NOAA ZGSZ 整度°C口径结算；以 weather.gov Temp 列在当日全部小时最终完成后的最高整度摄氏值为准。",
     },
     "beijing": {
         "name": "Beijing",