Scan project for malware and security issues

[semanticintent]

• Add filter_by_status_class() to cloudflare.py with clear docstring
• Replace inline lambda in cf_errors command with the new function
• Add test for filter_by_status_class behavior
• Improves code readability and documents the status class matching logic

The function matches entire HTTP status classes by first digit:

• '502' matches all 5xx (500, 502, 503, etc.)
• '404' matches all 4xx (400, 401, 404, etc.)

Description

Brief description of what this PR does.

Related Issues

Fixes #(issue number)

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• New parser (adds support for a new log format)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• My code follows the project's style guidelines
• I have tested my changes locally
• I have added tests for new functionality
• All tests pass (pytest tests/ -v)
• I have updated documentation if needed
• My changes work on Windows (or I've noted platform limitations)

Testing

Describe how you tested your changes:

# Commands you ran to test

Screenshots (if applicable)

Add screenshots of CLI output if relevant.

Additional Notes

Any other information reviewers should know.