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/httpapp.py

@@ -42,7 +42,7 @@ class HubRequestHandler(BaseHTTPRequestHandler):
                 self._json({"status": "ok"}, HTTPStatus.OK)
                 return
             if path.startswith("/v1/"):
-                self._v1(path, parsed.query)
+                self._v1(path, parsed.query, method)
                 return
             if path.startswith("/admin/api/"):
                 self._admin_api(method, path)
@@ -66,11 +66,16 @@ class HubRequestHandler(BaseHTTPRequestHandler):
             LOGGER.exception("internal error")
             self._json({"error": {"code": "INTERNAL", "message": "internal error"}}, HTTPStatus.INTERNAL_SERVER_ERROR)
 
-    def _v1(self, path: str, query: str) -> None:
+    def _v1(self, path: str, query: str, method: str = "GET") -> None:
         token = self.headers.get("X-Datahub-Token", "")
         if not self.hub.auth.check_api_token(token):
             self.hub.pipeline.audit("anonymous", "unauthorized", path, "")
             raise ApiError("UNAUTHORIZED", "missing or invalid X-Datahub-Token")
+        if path == "/v1/query" and method == "POST":
+            body = self._read_json(max_bytes=1_000_000)
+            payload = self.hub.api.query_api(body)
+            self._json(payload, HTTPStatus.OK)
+            return
         payload = self.hub.api.handle(path, parse_query(query))
         self._json(payload, HTTPStatus.OK)
 
@@ -184,11 +189,11 @@ class HubRequestHandler(BaseHTTPRequestHandler):
         self.end_headers()
         self.wfile.write(content)
 
-    def _read_json(self, allow_empty: bool = False) -> dict[str, Any]:
+    def _read_json(self, allow_empty: bool = False, max_bytes: int = 65536) -> dict[str, Any]:
         length = int(self.headers.get("Content-Length", "0") or 0)
         if length == 0 and allow_empty:
             return {}
-        if length <= 0 or length > 65536:
+        if length <= 0 or length > max_bytes:
             raise ValueError("请求内容为空或过大")
         raw = self.rfile.read(length)
         try: