fix(scrape): preserve ordered list markers

[OnlyYu1996]

Summary

• render <li> items under <ol> with numbered Markdown markers instead of unordered - bullets
• preserve unordered markers for <ul> items, including nested unordered lists inside ordered lists
• honor the ordered list start attribute when numbering begins above 1
• fix a stale test import so the current cortex-cli test harness compiles

Fixes PlatformNetwork/bounty-challenge#53127.

Validation

• cargo fmt --package cortex-cli --check
• cargo test --package cortex-cli test_html_to_markdown_ordered_lists -- --nocapture
• cargo test --package cortex-cli scrape_cmd::tests -- --nocapture
• cargo check --package cortex-cli --lib
• git diff --check

Notes: validation passes with existing warnings in src/cortex-tui/src/external_editor.rs and src/cortex-cli/src/utils/notification.rs that are unrelated to this patch.

[greptile-apps]

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