fix(HEL-494): 切断网站生产装配外源直连，iFinD 与实时观察改走中枢

生产 gateway 不再实例化 iFinD、东财图和免费实时聚合器；问财与竞价快照作为中枢内部数据源。全站阻断外源测试覆盖日K、报价、图表、问财和竞价快照。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

backend/data/gateway.py

@@ -7,13 +7,13 @@ from typing import Any
 
 from backend.data.contracts import DataUsage
 from backend.data.datahub import DatahubAwareTushareClient, DatahubBridge, DatahubClient, DatahubSettings
+from backend.data.datahub.ifind_proxy import HubIfindProxy
+from backend.data.datahub.realtime_proxy import HubRealtimeProxy
 from backend.data.policy import DataSourcePolicy
 from backend.data.providers import IfindProvider, TushareProvider
 from backend.data.quality import DataQualityGate, QualityEvidence, QualityReport
-from backend.data.providers.ifind_client import IfindHttpClient
 from backend.data.providers.tushare_client import TushareClient
-from backend.data.realtime import WebRealtimeAggregator
-from backend.features.market.charts import EastmoneyChartClient, MarketChartClient
+from backend.features.market.charts import MarketChartClient
 
 
 @dataclass(frozen=True)
@@ -23,11 +23,11 @@ class DataGateway:
     tushare_provider: TushareProvider
     ifind_provider: IfindProvider
     chart_data: MarketChartClient
-    realtime_observer: WebRealtimeAggregator
+    realtime_observer: HubRealtimeProxy
     datahub: DatahubBridge
 
     @property
-    def ifind(self) -> IfindHttpClient:
+    def ifind(self) -> HubIfindProxy:
         return self.ifind_provider.client
 
     def tushare(
@@ -102,10 +102,6 @@ def build_data_gateway(
     tushare_token_supplier: Callable[[], str] | None = None,
     datahub_settings: DatahubSettings | None = None,
 ) -> DataGateway:
-    ifind = IfindHttpClient(
-        str(credentials.get("ifind_refresh_token") or ""),
-        str(credentials.get("ifind_access_token") or ""),
-    )
     token_supplier = tushare_token_supplier or (
         lambda: str(credentials.get("tushare_token") or "")
     )
@@ -113,12 +109,13 @@ def build_data_gateway(
     settings = datahub_settings or DatahubSettings.load(credentials=credentials)
     datahub_client = DatahubClient(settings)
     datahub = DatahubBridge(settings, datahub_client)
+    ifind = HubIfindProxy(datahub)
     return DataGateway(
         policy=policy,
         quality=DataQualityGate.load(policy),
         tushare_provider=TushareProvider(token_supplier),
         ifind_provider=IfindProvider(ifind),
-        chart_data=MarketChartClient(ifind, EastmoneyChartClient(), datahub),
-        realtime_observer=WebRealtimeAggregator(),
+        chart_data=MarketChartClient(datahub),
+        realtime_observer=HubRealtimeProxy(datahub),
         datahub=datahub,
     )