Release v5.0.1: Debian packaging and apt repository support

This release adds official Debian package support with apt.mazzlabs.works repository, comprehensive installation documentation, and fixes import compatibility issues for Debian packaging.

Key features:
- Official Debian package installation via apt
- Updated documentation with installation guides
- Fixed pytest compatibility issues
- Resolved import failures in legacy modules
- Enhanced test suite reliability
- Improved redaction function handling

Installation:
  echo 'deb [signed-by=/usr/share/keyrings/mazzlabs-archive-keyring.gpg] https://apt.mazzlabs.works/ stable main' | sudo tee /etc/apt/sources.list.d/mazzlabs.list
  curl -fsSL https://apt.mazzlabs.works/mazzlabs-archive-keyring.gpg | sudo gpg --dearmor -o /usr/share/keyrings/mazzlabs-archive-keyring.gpg
  sudo apt update && sudo apt install sys-scan-graph