Bundle PBS Python 3.12 + PyQt6, restore Python plugins as .py files

- Replace portable Python approach with python-build-standalone 3.12.13
  (20260310 release) bundled directly in the distribution. Python is now
  always available without user setup — removes the Python settings tab.

- PyQt6 staged to plugins/libs/PyQt6/ with bundled Qt stripped out;
  patchelf'd to use our existing bundled Qt in lib/ instead of duplicating it.

- Restored native-converted plugins back to .py files:
  Form43Checker, ScriptExtenderPluginChecker, DDSPreview, basic_games,
  rootbuilder, installer_omod. Removed all *_native CMake targets.

- pythonrunner.cpp: removed venv/MO2_PYTHON_DIR lookup; always uses
  bundled Python at <exe_dir>/python, system Python as last-resort fallback.

- plugincontainer.cpp: removed fluorine/python_enabled gate (Python always
  loads), demoted proxy loading log messages from warn to debug, silenced
  [plugin-diag] stderr spam.

- Dockerfile: switched from uv venv to PBS install_only tarball; PBS Python
  used for both build-time pybind11 compilation and runtime distribution.

- build-inner.sh: aggressive Python staging (strip test/tkinter/ensurepip/
  distutils/lib2to3/idlelib; wipe build-time site-packages, restore psutil+vdf).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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