Refactor code structure for improved readability and maintainability

main.py

@@ -5,19 +5,12 @@ from models.database import init_db
 from models.migration import migration
 from pkg.lifespan import lifespan
 from pkg.JWT import jwt as JWT
-from pkg.log import set_log_level
 
 # 添加初始化数据库启动项
 lifespan.add_startup(init_db)
 lifespan.add_startup(migration)
 lifespan.add_startup(JWT.load_secret_key)
 
-# 设置日志等级
-if appmeta.debug:
-    set_log_level('DEBUG')
-else:
-    set_log_level('INFO')
-
 # 创建应用实例并设置元数据
 app = FastAPI(
     title=appmeta.APP_NAME,