Fix VFS empty dirs in overwrite and add LOOT Sort button

VFS: Remove physical directory creation from mo2_lookup auto-mkdir.
Previously, any dotless path component that missed the VFS tree was
immediately created on disk, leaving hundreds of empty directories in
overwrite (Shaders/, STRINGS/, DLLPlugins/, etc.) after a session.
Now a phantom virtual node is inserted instead — createFile() already
calls create_directories on the parent path, so the real directory
materialises on disk only when a file is actually written inside it.
mo2_rmdir already handles phantom (disk-absent) directories correctly.

LOOT: Add lootmanager.h/cpp which downloads the latest win64 .7z from
the GitHub releases API, extracts it to ~/.local/share/fluorine/tools/loot/
using the bundled 7zz or any system 7z tool, and exposes isLootInstalled()
/ getLootExePath(). Add a Sort button to the plugins tab that downloads
LOOT on first use (same progress-dialog pattern as SLR) then launches
LOOT.exe hooked through the active Proton via ProcessRunner so it sees
the full merged VFS. Button is hidden for games that don't use LOOT
sorting.

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

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