Add FUSE external mapping support, BG3/Oblivion Remastered fixes, fomod-plus and NaK integration

FUSE VFS now deploys non-data-dir mod mappings (Paks, OBSE, UE4SS, etc.)
via real symlinks and injects file-level data-dir mappings (plugins.txt,
loadorder.txt) into the VFS tree. Fixes game launches for Oblivion
Remastered (Root Builder path resolution, script extender support) and
BG3 (Wine prefix documents directory, file mapper symlinks on Linux).

Vendors mo2-fomod-plus plugin and NaK crate for FOMOD installer and
game finder/runtime support.

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

1 files changed, 49 insertions, 0 deletions

diff --git a/libs/installer_fomod_plus/patchwizard/lib/PatchFinder.h b/libs/installer_fomod_plus/patchwizard/lib/PatchFinder.h
new file mode 100644
index 0000000..02327e3
--- /dev/null
+++ b/libs/installer_fomod_plus/patchwizard/lib/PatchFinder.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "../../installer/lib/Logger.h"
+
+#include <FomodDB.h>
+#include <imodinterface.h>
+#include <imoinfo.h>
+#include <ifiletree.h>
+
+struct AvailablePatch {
+    FomodOption fomod_option;
+    std::string installer_name;
+    std::string patch_for_mod;
+    bool installed = false;
+    bool hidden    = false;
+    bool userDeselected = false;  // True if user explicitly chose not to install
+};
+
+class PatchFinder {
+friend class FomodPlusPatchWizard;
+
+public:
+    explicit PatchFinder(MOBase::IOrganizer* m_organizer) : m_organizer(m_organizer)
+    {
+        mFomodDb = std::make_unique<FomodDB>(m_organizer->basePath().toStdString());
+        logMessage(DEBUG, "mFomodDb loaded.");
+    }
+
+    std::vector<AvailablePatch> getAvailablePatchesForMod(const MOBase::IModInterface* mod);
+    std::vector<AvailablePatch> getAvailablePatchesForModList();
+
+protected:
+    void populateInstalledPlugins();
+
+private:
+    Logger& log = Logger::getInstance();
+    MOBase::IOrganizer* m_organizer;
+    std::unique_ptr<FomodDB> mFomodDb;
+
+    // Map of { pluginPtr: [1.esp, 2.esp, 3.esp] }
+    std::unordered_map<const MOBase::IModInterface*, std::vector<std::string> > m_installedPlugins;
+    std::unordered_set<std::string> m_installedPluginsCacheSet;
+
+    void logMessage(const LogLevel level, const std::string& message) const
+    {
+        log.logMessage(level, "[PATCHFINDER] " + message);
+    }
+
+};
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