feat(HEL-490): 剩余行情改由数据中枢主线路提供

正式页面以 8766 为主线路，旧接口只作故障备用；compose 钉死全部 DATAHUB_READ_*，避免现网残留 0 造成假完成。

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

tests/test_chart_data_provider.py

@@ -155,10 +155,12 @@ class ChartLookbackTests(unittest.TestCase):
 
 
 class FakeHub:
-    def __init__(self, chart=None, error=None):
+    def __init__(self, chart=None, error=None, daily=None):
         self.chart = chart
         self.error = error
+        self.daily = daily
         self.calls: list[str] = []
+        self.legacy: list[str] = []
 
     def try_intraday(self, code):
         self.calls.append(code)
@@ -166,6 +168,15 @@ class FakeHub:
             raise self.error
         return self.chart
 
+    def try_daily_chart(self, code, end_date, limit=90, dataset="daily"):
+        self.calls.append(f"{dataset}:{code}")
+        if self.error:
+            raise self.error
+        return self.daily
+
+    def record_legacy(self, dataset, source="", error=""):
+        self.legacy.append(dataset)
+
 
 class DatahubChartFallbackTests(unittest.TestCase):
     def setUp(self) -> None:
@@ -207,6 +218,25 @@ class DatahubChartFallbackTests(unittest.TestCase):
             self.assertGreaterEqual(len(payload["points"]), 1)
             self.assertTrue(fallback.requests)
 
+    def test_datahub_daily_skips_ifind(self):
+        hub = FakeHub(
+            daily=[
+                {
+                    "trade_date": "2026-09-07",
+                    "open": 10.0,
+                    "high": 10.4,
+                    "low": 9.9,
+                    "close": 10.2,
+                    "volume": 1000,
+                    "amount_billion": 0.02,
+                }
+            ]
+        )
+        client = MarketChartClient(IfindHttpClient(), LookbackChartClient(), hub)
+        rows = client.stock_daily("600000", "20260907")
+        self.assertEqual(rows[-1]["trade_date"], "2026-09-07")
+        self.assertIn("daily:600000", hub.calls)
+
 
 class ChartServiceStub:
     @staticmethod