Reject logs paths viewing flags

[GreyforgeLabs]

Summary

• Configure logs --paths to reject viewing-only flags instead of silently ignoring them.
• Keep plain logs --paths valid with the default line count.
• Add CLI regression coverage for --follow, --level, and explicit --lines conflicts.

Fixes PlatformNetwork/bounty-challenge#52724.

Validation

• cargo test -p cortex-cli --test logs_paths_conflicts --no-default-features --features cortex-tui -- --nocapture
• cargo check -p cortex-cli --no-default-features --features cortex-tui
• cargo fmt --package cortex-cli --check
• git diff --check
• git diff --cached --check

[greptile-apps]

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