package: prune unused PyQt6 modules and dedupe lib/

Shrinks the staging tree by ~27 MB (~250M -> ~223M) via two changes in
docker/build-inner.sh:

1. PyQt6 prune. Allowlist QtCore/QtGui/QtWidgets/QtOpenGL/QtOpenGLWidgets
   (confirmed by full-repo grep of all shipped Python plugins). Drop the
   remaining ~30 .abi3.so bindings plus bindings/, uic/, lupdate/, every
   .pyi stub, every __pycache__. Pruning runs BEFORE the existing
   ldd-scan loop, so libQt6Designer/Help/Sql/Test/SvgWidgets/Bluetooth/...
   stop getting pulled into lib/ as a side effect.

   plugins/libs/PyQt6: 31M -> 14M.

2. Dedupe lib/. cp -Lf on globs like libboost_program_options.so* stages
   the unversioned soname and the versioned SO as identical real files.
   Adds a post-bundling pass that, for each *.so / *.so.N file, finds a
   byte-identical versioned twin via cmp -s and replaces it with a
   symlink. Skips existing symlinks. Fixes the boost_program_options,
   boost_thread, and xcb-cursor duplicates that have been here from the
   start.

Also removes the now-orphan fluorine_vfs.dll / fluorine_vfs_hid.dll /
libfluorine_vfs_preload.so staging block left behind after the VFS shim
removal in 2ed0704f.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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