fix: RSS channel metadata leakage / crash, and ZIP option forwarding

[4ngv4eek4k1hpa]

Summary

• RSS/Atom: look up channel/feed fields on direct children only. getElementsByTagName is recursive, so a feed without <title> incorrectly stole the first item/entry title (metadata leakage).
• RSS: initialize md_text before conditionals so feeds with no titles no longer raise UnboundLocalError (bug: RSS converter crashes with UnboundLocalError when channel title is missing #1946).
• Atom: omit # None when the feed title is missing.
• ZIP: forward caller kwargs (e.g. keep_data_uris) into nested convert_stream calls, and skip directory-only zip entries.

Why

Real-world RSS exports often omit channel <title>. That used to either crash conversion or silently use an item title as the feed title. ZIP members also ignored per-call options that standalone conversion honors.

Test plan

• python packages/markitdown/tests/test_rss_zip_fixes.py (RSS leak/crash + ZIP keep_data_uris)
• Existing test_rss.xml vector still converts with channel title preferred

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