fix(HEL-494): enforce datahub as sole website market boundary

Co-authored-by: multica-agent <github@multica.ai>

backend/features/market/service.py

@@ -14,7 +14,7 @@ from backend.bootstrap.config import (
     validate_text,
 )
 from backend.data.providers.ifind_client import IfindError
-from backend.data.providers.tushare_client import TushareClient, TushareError
+from backend.data.providers.tushare_client import TushareError
 from backend.data.providers.tushare_helpers import _moneyflow_payload, _optional_number
 from backend.data.realtime import RealtimeAggregateError
 from backend.features.market.backfill_history import (
@@ -61,16 +61,14 @@ class MarketServiceMixin:
             self._tushare_client(),
             ifind=self.ifind,
         )
-    def _tushare_client(self) -> TushareClient:
+    def _tushare_client(self) -> Any:
+        override = getattr(self, "_market_client_override", None)
+        if override is not None:
+            return override
         gateway = getattr(self, "data_gateway", None)
-        if gateway is not None:
-            return gateway.tushare()
-        # Compatibility for isolated legacy unit-test service stubs.
-        client = TushareClient(self.token)
-        aggregator = getattr(self, "realtime_aggregator", None)
-        if aggregator is not None:
-            client.realtime_aggregator = aggregator
-        return client
+        if gateway is None:
+            raise RuntimeError("数据中枢尚未装配。")
+        return gateway.tushare()
 
     def _now(self) -> datetime:
         clock = getattr(self, "clock", None)
@@ -178,11 +176,10 @@ class MarketServiceMixin:
             return "最近可用交易日"
         return f"{int(compact[4:6])} 月 {int(compact[6:8])} 日"
 
-    @classmethod
-    def _preparing_display_notice(cls, actual_date: str, requested_date: str) -> str:
-        shown = cls._chinese_month_day(actual_date)
+    def _preparing_display_notice(self, actual_date: str, requested_date: str) -> str:
+        shown = self._chinese_month_day(actual_date)
         requested = str(requested_date or "").replace("-", "")
-        if requested == date.today().strftime("%Y%m%d"):
+        if requested == self._now().strftime("%Y%m%d"):
             return f"今日数据正在准备，当前展示 {shown}"
         return f"所选日期数据尚未到齐，当前展示 {shown}"