feat(HEL-382): 搭建 datahub 底座和盘后正式数据链路

新增独立 xiaobai-datahub 服务（SQLite WAL、Tushare 盘后发布、/v1 契约和管理后台），不改现站页面与数据链路。

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

xiaobai-datahub/server.py

@@ -0,0 +1,27 @@
+"""xiaobai-datahub process entry."""
+
+from __future__ import annotations
+
+import argparse
+
+from datahub.hub import build_hub
+from datahub.httpapp import serve
+from datahub.settings import load_settings
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="xiaobai-datahub")
+    parser.add_argument("--host", default=None)
+    parser.add_argument("--port", type=int, default=None)
+    args = parser.parse_args()
+    settings = load_settings()
+    if args.host:
+        settings.host = args.host
+    if args.port:
+        settings.port = args.port
+    hub = build_hub(settings)
+    serve(hub, settings.host, settings.port)
+
+
+if __name__ == "__main__":
+    main()