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>

tests/test_chart_data_provider.py

@@ -2,7 +2,6 @@ from __future__ import annotations
 
 import unittest
 
-from backend.data.providers.ifind_client import IfindHttpClient
 from backend.features.market.charts import ChartDataError, EastmoneyChartClient, HIS_TRENDS_URL, MarketChartClient, TRENDS_URL
 from server import DashboardService
 
@@ -196,7 +195,7 @@ class DatahubChartFallbackTests(unittest.TestCase):
             }
         )
         fallback = LookbackChartClient()
-        client = MarketChartClient(IfindHttpClient(), fallback, hub)
+        client = MarketChartClient(hub)
         payload = client.stock_intraday("601318")
         self.assertEqual(payload["source"], "datahub")
         self.assertEqual(hub.calls, ["601318"])
@@ -212,7 +211,7 @@ class DatahubChartFallbackTests(unittest.TestCase):
         ):
             EastmoneyChartClient._cache.clear()
             fallback.requests.clear()
-            client = MarketChartClient(IfindHttpClient(), fallback, hub)
+            client = MarketChartClient(hub)
             with self.assertRaises(ChartDataError):
                 client.stock_intraday("000001")
             self.assertEqual(fallback.requests, [])
@@ -231,7 +230,7 @@ class DatahubChartFallbackTests(unittest.TestCase):
                 }
             ]
         )
-        client = MarketChartClient(IfindHttpClient(), LookbackChartClient(), hub)
+        client = MarketChartClient(hub)
         rows = client.stock_daily("600000", "20260907")
         self.assertEqual(rows[-1]["trade_date"], "2026-09-07")
         self.assertIn("daily:600000", hub.calls)