chore: 重构前基线 — 9 个 sync task 全部 ok + akshare 移除 + mairui 资金流接入

状态：
- 9 个 sync task（stock_basic / kline_daily / kline_index / kline_5min /
  moneyflow / industry_sector / sector_features / share_snapshot / market_regime）
- 数据源：baostock + mairui + 雪球(pysnowball) + 新浪（4 个）
- 项目级约束：永远不用 akshare（已落实）
- kline_5min 改用 DB 快照统一全量/增量逻辑
- 零后端 Chrome 扩展 xueqiu_sync（独立项目）

app/core/utils/__init__.py

@@ -0,0 +1,4 @@
+"""通用工具。"""
+from app.core.utils.logging import get_logger, setup_logging
+
+__all__ = ["get_logger", "setup_logging"]

app/core/utils/logging.py

@@ -0,0 +1,60 @@
+"""统一日志：同时输出到控制台 + 文件。"""
+from __future__ import annotations
+
+import logging
+import sys
+from logging.handlers import RotatingFileHandler
+from pathlib import Path
+
+from app.core.config import settings
+
+_INITIALIZED = False
+
+
+def _build_formatter() -> logging.Formatter:
+    return logging.Formatter(
+        "[%(asctime)s] %(levelname)-5s %(name)s | %(message)s",
+        datefmt="%Y-%m-%d %H:%M:%S",
+    )
+
+
+def setup_logging(level: str | None = None) -> None:
+    global _INITIALIZED
+    if _INITIALIZED:
+        return
+
+    lvl = (level or settings.log_level or "INFO").upper()
+    root = logging.getLogger()
+    root.setLevel(lvl)
+    # 清掉 uvicorn / sqlalchemy 默认 handler，避免重复输出
+    for h in list(root.handlers):
+        root.removeHandler(h)
+
+    fmt = _build_formatter()
+
+    console = logging.StreamHandler(sys.stdout)
+    console.setFormatter(fmt)
+    root.addHandler(console)
+
+    log_path: Path = settings.log_path
+    file_handler = RotatingFileHandler(
+        log_path / "market_data_sync.log",
+        maxBytes=20 * 1024 * 1024,
+        backupCount=5,
+        encoding="utf-8",
+    )
+    file_handler.setFormatter(fmt)
+    root.addHandler(file_handler)
+
+    # 抑制第三方库过度刷屏
+    logging.getLogger("baostock").setLevel(logging.WARNING)
+    logging.getLogger("urllib3").setLevel(logging.WARNING)
+    logging.getLogger("sqlalchemy.engine").setLevel(logging.WARNING)
+
+    _INITIALIZED = True
+
+
+def get_logger(name: str) -> logging.Logger:
+    if not _INITIALIZED:
+        setup_logging()
+    return logging.getLogger(name)