feat: 增加 YAML 配置与一键启动脚本

backend/app/db/session.py

@@ -1,14 +1,15 @@
 from __future__ import annotations
 
-import os
 from collections.abc import Generator
 from contextlib import contextmanager
 
 from sqlalchemy import create_engine
 from sqlalchemy.orm import Session, sessionmaker
 
+from app.core.config import get_settings
 
-DATABASE_URL = os.getenv("DATABASE_URL", "postgresql+psycopg://yg_ft:change_me@localhost:15432/yg_ft")
+
+DATABASE_URL = get_settings().database_url
 
 engine = create_engine(
     DATABASE_URL,
@@ -37,4 +38,3 @@ def session_scope() -> Generator[Session, None, None]:
         raise
     finally:
         db.close()
-