ai-demo/app/__init__.py

# 延迟导入，避免循环依赖
__all__ = ["app"]

# 导入 tools 模块，触发工具注册
import app.tools

def __getattr__(name):
    if name == "app":
        from app.main import app
        return app
    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")