[BUG] create local path collection failed

[iziang]

Describe the bug

[2025-04-09 11:48:41,009: ERROR/MainProcess] Task aperag.tasks.sync_documents_task.sync_documents[1c15a33f-1919-414a-84c1-c8b80ba8b9ec] raised unexpected: KeyError('path')
Traceback (most recent call last):
File "/Users/slc/Library/Caches/pypoetry/virtualenvs/aperag-P2aLB1H5-py3.11/lib/python3.11/site-packages/celery/app/trace.py", line 477, in trace_task
R = retval = fun(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^
File "/Users/slc/Library/Caches/pypoetry/virtualenvs/aperag-P2aLB1H5-py3.11/lib/python3.11/site-packages/celery/app/trace.py", line 760, in protected_call
return self.run(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/slc/code/ApeRAG/aperag/tasks/sync_documents_task.py", line 118, in sync_documents
if not os.path.exists(src_doc.metadata["path"]):
~~~~~~~~~~~~~~~~^^^^^^^^
KeyError: 'path'

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