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/logutil.py

@@ -0,0 +1,56 @@
+from __future__ import annotations
+
+import json
+import logging
+import sys
+from typing import Any
+
+from datahub.timeutil import isoformat
+
+_SECRET_KEYS = (
+    "token", "password", "secret", "key", "authorization", "credential",
+    "tushare_token", "datahub_token", "encryption_key", "cookie",
+)
+
+
+def _redact(value: Any, key: str = "") -> Any:
+    lowered = key.lower()
+    if any(part in lowered for part in _SECRET_KEYS):
+        return "***"
+    if isinstance(value, dict):
+        return {str(item_key): _redact(item_value, str(item_key)) for item_key, item_value in value.items()}
+    if isinstance(value, list):
+        return [_redact(item) for item in value]
+    return value
+
+
+class JsonFormatter(logging.Formatter):
+    def format(self, record: logging.LogRecord) -> str:
+        payload: dict[str, Any] = {
+            "ts": isoformat(),
+            "level": record.levelname,
+            "logger": record.name,
+            "message": record.getMessage(),
+        }
+        extra = getattr(record, "hub", None)
+        if isinstance(extra, dict):
+            payload.update(_redact(extra))
+        if record.exc_info:
+            payload["exc"] = self.formatException(record.exc_info)
+        return json.dumps(payload, ensure_ascii=False, default=str)
+
+
+def configure_logging(level: str = "INFO") -> logging.Logger:
+    logger = logging.getLogger("datahub")
+    if logger.handlers:
+        return logger
+    handler = logging.StreamHandler(sys.stdout)
+    handler.setFormatter(JsonFormatter())
+    logger.addHandler(handler)
+    logger.setLevel(getattr(logging, level.upper(), logging.INFO))
+    logger.propagate = False
+    return logger
+
+
+def get_logger() -> logging.Logger:
+    return logging.getLogger("datahub")