refactor: route market providers through data gateway

backend/data/providers/tushare.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from collections.abc import Callable
+
+from tushare_client import TushareClient
+
+
+class TushareProvider:
+    def __init__(
+        self,
+        token_supplier: Callable[[], str],
+        client_factory: Callable[[str], TushareClient] = TushareClient,
+    ) -> None:
+        self._token_supplier = token_supplier
+        self._client_factory = client_factory
+
+    def client(self) -> TushareClient:
+        return self._client_factory(str(self._token_supplier() or "").strip())