Install:
- install.py: in preFlightsChecks.call(), replace missing CyberPanel python
with /usr/bin/python3 and force shell=True so any code path (including
old/cached script) never hits FileNotFoundError.
Upgrade:
- cyberpanel_upgrade.sh: resolve CP_PYTHON (CyberPanel, CyberCP, python3)
before running upgrade.py and configure.py; use it for both.
- plogical/upgrade.py: add _python_for_manage(), use it in GeneralMigrations,
collectstatic, and upgradePip so migrations/collectstatic work when
/usr/local/CyberPanel/bin/python is missing.
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