莫斯科数据源简化：移除 METAR 集群 + NOAA 结算，仅保留 UUWW 单站

- city_registry: settlement_source noaa → metar
- weather_sources: 移除 Moscow METAR cluster 5 站配置
- country_networks: 删除 RussiaStationWebNetworkProvider 类
- 文档: Tier 4 备注更新

src/data_collection/country_networks.py

@@ -191,8 +191,6 @@ def _provider_code_for_city(city: str) -> str:
         return "saudi_ncm"
     if normalized == "paris":
         return "fr_aeroweb"
-    if normalized == "moscow":
-        return "russia_metar_cluster"
     if settlement_source == "hko":
         return "hongkong_hko"
     if settlement_source == "cwa":
@@ -984,24 +982,6 @@ class KoreaKmaNetworkProvider(CountryNetworkProvider):
         }
 
 
-class RussiaStationWebNetworkProvider(CountryNetworkProvider):
-    def __init__(self) -> None:
-        super().__init__("russia_metar_cluster", "Moscow METAR network")
-
-    def official_nearby_current(self, city: str, raw: Dict[str, Any]) -> List[Dict[str, Any]]:
-        return _metar_cluster_rows(raw)
-
-    def official_network_status(self, city: str, raw: Dict[str, Any]) -> Dict[str, Any]:
-        rows = self.official_nearby_current(city, raw)
-        return {
-            "provider_code": self.provider_code,
-            "provider_label": self.provider_label,
-            "available": bool(rows),
-            "mode": "realtime_metar_cluster" if rows else "reference_only",
-            "row_count": len(rows),
-        }
-
-
 class IsraelImsNetworkProvider(CountryNetworkProvider):
     def __init__(self) -> None:
         super().__init__("israel_ims", "IMS Lod Airport")
@@ -1161,8 +1141,6 @@ def get_country_network_provider(city: str) -> CountryNetworkProvider:
         return TurkeyMgmNetworkProvider()
     if provider_code == "korea_kma":
         return KoreaKmaNetworkProvider()
-    if provider_code == "russia_metar_cluster":
-        return RussiaStationWebNetworkProvider()
     if provider_code == "japan_jma":
         return JapanJmaNetworkProvider()
     if provider_code == "china_cma":