- Modified mount_target and partition_disk methods to use clean environment
- Removed PyInstaller environment variables (LD_*, PYINSTALLER_*, PYTHON*) from subprocess calls
- This prevents PyInstaller from interfering with system library loading in subprocess
- Ensures mount, parted, mkfs.ext4, and other system commands use correct system libraries
- Resolves persistent library version conflicts in frozen binary
- System commands now execute with proper environment isolation

This completely resolves the PyInstaller frozen binary mount and system command issues
by ensuring subprocess calls use clean environment without PyInstaller interference.