将 postgresql_info.py 移出 native/，合并到 core/config.py 或 infra/db/，便于后续项目环境变量读取发生变化

app/services/simulation.py

@@ -20,7 +20,7 @@ import logging
 import app.services.globals as globals
 import uuid
 import app.services.project_info as project_info
-from app.native.wndb.postgresql_info import get_pgconn_string
+from app.core.config import get_pgconn_string
 from app.infra.db.timescaledb.internal_queries import (
     InternalQueries as TimescaleInternalQueries,
 )