fix(data): read_db_daily 配置 vnpy database 路径（修端到端读取 gap）

Fix: read_db_daily 现在在调用 get_database() 前配置 vnpy SETTINGS，
指向 cfg.data_paths["vnpy_db"]（NAS quant_trading.db），修复端到端冒烟发现的读取 gap。

sanguo_data/datareader.py

@@ -13,6 +13,7 @@ from datetime import datetime
 from vnpy.trader.object import BarData
 from vnpy.trader.constant import Exchange, Interval
 from vnpy.trader.database import get_database
+from vnpy.trader.setting import SETTINGS
 
 def read_parquet_daily(symbol: str, start: str, end: str, cfg) -> list[BarData]:
     daily_dir = Path(cfg.data_paths["daily_dir"])
@@ -55,6 +56,10 @@ def guess_exchange(symbol: str) -> Exchange:
 
 
 def read_db_daily(symbol: str, start: str, end: str, cfg) -> list[BarData]:
+    # Configure vnpy database SETTINGS before calling get_database()
+    SETTINGS["database.name"] = "sqlite"
+    SETTINGS["database.database"] = cfg.data_paths["vnpy_db"]
+
     db = get_database()
     start_dt = datetime.strptime(start, "%Y-%m-%d")
     end_dt = datetime.strptime(end, "%Y-%m-%d")