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/datahub/adapters/__init__.py

@@ -0,0 +1,15 @@
+from datahub.adapters.akshare import ADAPTER as akshare
+from datahub.adapters.eastmoney import ADAPTER as eastmoney
+from datahub.adapters.ifind import ADAPTER as ifind
+from datahub.adapters.tencent import ADAPTER as tencent
+from datahub.adapters.ths import ADAPTER as ths
+from datahub.adapters.xgb import ADAPTER as xgb
+
+RESERVED = {
+    "eastmoney": eastmoney,
+    "tencent": tencent,
+    "ths": ths,
+    "xgb": xgb,
+    "akshare": akshare,
+    "ifind": ifind,
+}