Fixed

• elesync.commands missing from pip/wheel. pyproject.toml listed
  only packages = ["elesync"], so the elesync.commands subpackage
  (backup/restore/export) was never installed. Every ele command
  crashed with ModuleNotFoundError: No module named 'elesync.commands'.
  Now explicitly lists ["elesync", "elesync.commands"].
• PyInstaller hidden imports. Added elesync.commands and
  elesync.commands.backup to the spec's hidden imports list so the
  frozen ele.exe can find them too.
• PWA manifest not in wheel. Added static/*.json and static/*.svg
  to package-data so manifest.json ships in the pip package.