Clean up empty dirs left by VFS, suppress noisy Qt debug

Fixes #64: VFS now tracks the directories it creates outside the data
dir (external mappings + RootBuilder game-root deploys) and removes
them on unmount, but only if still empty. Pre-existing user dirs and
the game root itself are never touched. RootBuilder manifest gains a
"dirs" field so the cleanup survives a crashed session.

Also drops a Path-repr qDebug in bg3_file_mapper that crashed Qt's
logger on surrogate-escaped paths, and defaults QT_LOGGING_RULES to
default.debug=false in the launcher and AppRun (still overridable) so
the same class of plugin bug stays muted in shipped builds.

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

0 files changed, 0 insertions, 0 deletions