video_decode/src/workflows/__init__.py

try:
    from src.workflows.default.main_workflow import create_deconstruction_workflow, DeconstructionWorkflow
    __all__ = ['create_deconstruction_workflow', 'DeconstructionWorkflow']
except ImportError:
    # main_workflow.py 不存在，使用递归解构工作流
    try:
        from src.workflows.default.recursive_deconstruction_workflow import RecursiveDeconstructionWorkflow
        __all__ = ['RecursiveDeconstructionWorkflow']
    except ImportError:
        __all__ = []