fix(HEL-494): 数据中枢独占调度，主网站不再回退旧接口

主网站只向中枢要业务数据；来源选择、切源、补数全部在中枢内部完成，失败不再走东财/腾讯/Tushare 保底。

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

backend/data/providers/tushare_dashboard.py

@@ -251,27 +251,23 @@ class DashboardMixin:
             quotes = hub(trade_date)
             if quotes:
                 return list(quotes), "datahub"
-        rt_error = ""
+        named = getattr(self, "try_quotes", None)
+        code_list = [item for item in str(codes or "").split(",") if item]
+        if callable(named) and code_list:
+            collected: list[dict[str, Any]] = []
+            for index in range(0, len(code_list), 60):
+                collected.extend(named(code_list[index:index + 60]) or [])
+            if collected:
+                delayed = any(item.get("delayed") for item in collected)
+                return collected, "datahub_delayed" if delayed else "datahub"
         try:
             quotes = self.query("rt_k", {"ts_code": codes})
             if quotes:
-                self._mark_quote_legacy("tushare_rt_k", rt_error)
-                return list(quotes), "tushare_rt_k"
-            rt_error = f"No realtime data returned for {trade_date}"
+                delayed = any(item.get("delayed") for item in quotes)
+                return list(quotes), "datahub_delayed" if delayed else "datahub"
         except TushareError as exc:
-            rt_error = str(exc)
-        try:
-            quotes, quote_source = self._free_realtime_quotes(trade_date, codes)
-        except Exception as exc:
-            raise TushareError(
-                f"当天盘中实时行情不可用：rt_k={rt_error}；免费源={exc}"
-            ) from exc
-        if not quotes:
-            raise TushareError(
-                f"当天盘中实时行情不可用：rt_k={rt_error}；免费源=empty"
-            )
-        self._mark_quote_legacy(quote_source, rt_error)
-        return quotes, quote_source
+            raise TushareError(f"当天盘中实时行情不可用：{exc}") from exc
+        raise TushareError("当天盘中实时行情不可用：数据中枢未返回可用行情")
 
     def _mark_quote_legacy(self, source: str, error: str = "") -> None:
         marker = getattr(self, "record_datahub_legacy", None)
@@ -283,27 +279,8 @@ class DashboardMixin:
         trade_date: str,
         codes: str = "",
     ) -> tuple[list[dict[str, Any]], str]:
-        aggregator = self._realtime_aggregator()
-        last_error = ""
-        try:
-            quotes = aggregator.eastmoney_market_quotes(expected_date=trade_date)
-            if quotes:
-                return quotes, "eastmoney_clist"
-        except Exception as exc:
-            last_error = str(exc)
-        code_list = [item for item in str(codes or "").split(",") if item]
-        try:
-            if code_list:
-                quotes = aggregator.tencent_stock_quotes(code_list, expected_date=trade_date)
-            else:
-                quotes = aggregator.tencent_market_quotes(code_list, expected_date=trade_date)
-        except Exception as exc:
-            raise TushareError(
-                f"eastmoney={last_error or 'empty'}；tencent={exc}"
-            ) from exc
-        if not quotes:
-            raise TushareError(f"eastmoney={last_error or 'empty'}；tencent=empty")
-        return quotes, "tencent_qt"
+        del trade_date, codes
+        raise TushareError("主网站不再直连免费行情源，请走数据中枢")
 
     def _free_realtime_indices(self) -> list[dict[str, Any]]:
         hub = getattr(self, "try_index_quotes", None)
@@ -312,14 +289,7 @@ class DashboardMixin:
             converted = [item for item in (_hub_index_quote(row) for row in rows or []) if item]
             if converted:
                 return converted
-        try:
-            rows = self._realtime_aggregator().eastmoney_indices()
-            marker = getattr(self, "record_datahub_legacy", None)
-            if callable(marker):
-                marker("index_quotes", "eastmoney_push2")
-            return rows
-        except Exception:
-            return []
+        return []
 
     def _load_realtime_reference(
         self,
@@ -470,21 +440,6 @@ class DashboardMixin:
                 return dict(rows[0])
         except TushareError:
             pass
-        aggregator = getattr(self, "realtime_aggregator", None)
-        if aggregator is None:
-            return {}
-        for loader in (
-            getattr(aggregator, "eastmoney_stock_quote", None),
-            getattr(aggregator, "tencent_stock_quote", None),
-        ):
-            if not callable(loader):
-                continue
-            try:
-                quote = loader(ts_code, expected_date=reference_date)
-            except Exception:
-                continue
-            if quote:
-                return dict(quote)
         return {}
 
     def _stock_activity_metrics(