cli.py:
- Replace hardcoded paths with sysconfig.get_path('data', scheme) covering all
  pip install modes (venv, posix_user, posix_prefix, posix_home, system)
- Fall back to legacy hardcoded paths for extra safety
- Last-resort bootstrap: copy bundled aisbf/aisbf.sh to ~/.local/share/aisbf/
  when data_files were not installed by pip (known pip/wheel limitation)
- Improved error message with all checked paths and reinstall instructions

aisbf.sh:
- Replace hardcoded /usr/share/aisbf check (wrong: setup.py installs to
  /usr/local/share/aisbf) with a Python sysconfig lookup that checks the
  actual pip data prefix across all known schemes
- Derive LOG_DIR from SHARE_DIR instead of duplicating the detection logic

Packaging:
- Add aisbf/aisbf.sh as package_data so it is always present in the installed
  aisbf package regardless of data_files extraction success
- Add recursive-include aisbf *.sh to MANIFEST.in for sdist
- Add aisbf/aisbf.sh to setup.py data_files share/aisbf/aisbf listing