fix: propagate zip converter options to nested files

[zaidazmi]

Summary

Propagates keyword options from ZipConverter.convert() into nested convert_stream() calls for files inside archives. This preserves per-call options such as keep_data_uris=True when the converted file is inside a .zip.

This is complementary to #1977, which discusses storing/injecting keep_data_uris as a global option; this PR covers kwargs supplied on the ZIP conversion call itself.

Validation

• uv run --project packages/markitdown --extra all --with pytest python -m pytest packages/markitdown/tests/test_module_misc.py -k zip_conversion_propagates_keep_data_uris

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[zaidazmi]

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