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>

xiaobai-datahub/datahub/serving.py

@@ -87,12 +87,46 @@ class V1API:
             return self.index_quotes(q)
         if path == "/v1/intraday/points":
             return self.intraday_points(q)
+        if path == "/v1/sectors/quote":
+            return self.sector_quote(q)
+        if path == "/v1/limit-pool":
+            return self.limit_pool(q)
+        if path == "/v1/query":
+            return self.query_api(q)
         if path == "/v1/datasets/status":
             return self.dataset_status(q.get("date") or "")
         if path == "/v1/batches":
             return self.batches(q.get("date") or "", q.get("dataset") or "")
         raise ApiError("INVALID_ARGUMENT", f"unknown endpoint: {path}")
 
+    def query_api(self, body: dict[str, Any]) -> dict[str, Any]:
+        from datahub.steward import steward_query
+
+        payload = dict(body or {})
+        raw_params = payload.get("params")
+        if isinstance(raw_params, str):
+            payload["params"] = _parse_json(raw_params) or {}
+        return steward_query(self, payload)
+
+    def sector_quote(self, q: dict[str, str]) -> dict[str, Any]:
+        from datahub.realtime_serve import RealtimeApiError, fetch_sector_quote
+
+        code = str(q.get("code") or q.get("ts_code") or "").strip()
+        if not code:
+            raise ApiError("INVALID_ARGUMENT", "code is required")
+        try:
+            return fetch_sector_quote(self.db, code, str(q.get("date") or ""))
+        except RealtimeApiError as exc:
+            raise ApiError(exc.code, exc.message) from exc
+
+    def limit_pool(self, q: dict[str, str]) -> dict[str, Any]:
+        from datahub.realtime_serve import RealtimeApiError, fetch_limit_pool
+
+        try:
+            return fetch_limit_pool(self.db, str(q.get("date") or q.get("trade_date") or ""))
+        except RealtimeApiError as exc:
+            raise ApiError(exc.code, exc.message) from exc
+
     def health(self) -> dict[str, Any]:
         today = yyyymmdd(now_shanghai())
         cal = self.db.fetchone(