Client fails to pull on windows (when installed from pip)

When using the client on Windows outside of QGIS (e.g. installed through pip), it does not work correctly when trying to pull a new version that involves geodiff operations:

import mergin
client = mergin.MerginClient (login='john', password='topsecret')
client.download_project('john/project', 'C:/Data/Project')
# now do some modifications to a GeoPackage on the server
client.pull_project('C:/Data/Project')

It fails with the following traceback:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\XYZ\AppData\Roaming\Python\Python38\site-packages\mergin\client.py", line 546, in pull_project
    return pull_project_finalize(job)
  File "C:\Users\XYZ\AppData\Roaming\Python\Python38\site-packages\mergin\client_pull.py", line 553, in pull_project_finalize
    raise ClientError("Cannot patch basefile {}! Please try syncing again.".format(basefile))
mergin.common.ClientError: Cannot patch basefile C:\Data\Project\.mergin\test.gpkg! Please try syncing again.

It looks like the underlying issue is in geodiff as client-log.txt contains this error:

GEODIFF: Unable to enable sqlite3/gpkg extensions

从 client.py:546 和 client_pull.py:553 开始，然后检查 client-log.txt 以查找 GEODIFF 扩展错误。复现 issue 中描述的已安装 pip 的 Windows 工作流，并跟踪 GeoPackage pull 步骤。当 pull_project 能够针对已更改的 GeoPackage 完成，且不再出现报告的 ClientError 时，即表示完成。