fix(uninstall): include cache log directory

[OnlyYu1996]

Fixes PlatformNetwork/bounty-challenge#53185.

Summary

• Add uninstall collection for the cache-based logs directory used by cortex logs.
• Make the removal safety check accept lowercase cortex paths so .cache/cortex/logs can actually be removed.
• Add regression coverage for collecting existing/missing cache log directories and lowercase cortex path safety.

Validation

• cargo +1.90.0 fmt --package cortex-cli --check
• git diff --check

Targeted cargo +1.90.0 test -p cortex-cli test_collect_cache_log_items -- --nocapture is blocked in this Windows/MSVC environment before crate tests run by the existing �ws-lc-sys C build failure.

[greptile-apps]

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