Replace Python plugins with native C++ .so, remove bundled Python (~95MB)

- Add native plugins: form43_checker, script_extender_checker, preview_dds,
  basic_games (75 game defs via IPluginProxy pattern with Steam/GOG detection)
- Remove portable Python from Dockerfile and build-inner.sh
- Add Python settings tab with venv support (system python3 + PyQt6)
- Skip loading plugin_python.so when Python disabled (default: off)
- Update pythonrunner.cpp to use venv at ~/.local/share/fluorine/python-venv/
- Preserve real file permissions in FUSE VFS (fixes native executable +x bits)
- Add FUSE_SET_ATTR_MODE handler so chmod works through VFS
- Fix desktop shortcut Exec= to use fluorine-manager launcher, not bare binary

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

3 files changed, 195 insertions, 0 deletions

diff --git a/libs/form43_checker_native/src/CMakeLists.txt b/libs/form43_checker_native/src/CMakeLists.txt
new file mode 100644
index 0000000..9e847f6
--- /dev/null
+++ b/libs/form43_checker_native/src/CMakeLists.txt
@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.16)
+
+file(GLOB form43_checker_native_SOURCES CONFIGURE_DEPENDS
+  ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp
+  ${CMAKE_CURRENT_SOURCE_DIR}/*.h
+)
+
+add_library(form43_checker_native SHARED ${form43_checker_native_SOURCES})
+mo2_configure_plugin(form43_checker_native NO_SOURCES WARNINGS OFF)
+target_link_libraries(form43_checker_native PRIVATE mo2::uibase)
+mo2_install_plugin(form43_checker_native)
diff --git a/libs/form43_checker_native/src/form43checker.cpp b/libs/form43_checker_native/src/form43checker.cpp
new file mode 100644
index 0000000..e3cb676
--- /dev/null
+++ b/libs/form43_checker_native/src/form43checker.cpp
@@ -0,0 +1,131 @@
+#include "form43checker.h"
+
+#include <uibase/ipluginlist.h>
+#include <uibase/pluginrequirements.h>
+
+#include <QCoreApplication>
+#include <QFileInfo>
+
+using namespace MOBase;
+
+Form43Checker::Form43Checker() : m_organizer(nullptr) {}
+
+bool Form43Checker::init(IOrganizer* moInfo)
+{
+  m_organizer = moInfo;
+  return true;
+}
+
+QString Form43Checker::name() const
+{
+  return "Form 43 Plugin Checker (Native)";
+}
+
+QString Form43Checker::localizedName() const
+{
+  return tr("Form 43 Plugin Checker (Native)");
+}
+
+QString Form43Checker::author() const
+{
+  return "AnyOldName3";
+}
+
+QString Form43Checker::description() const
+{
+  return tr("Checks plugins (.ESM/.ESP files) to see if any are lower than "
+            "Form 44 (Skyrim SE).");
+}
+
+VersionInfo Form43Checker::version() const
+{
+  return VersionInfo(1, 2, 0, VersionInfo::RELEASE_FINAL);
+}
+
+std::vector<std::shared_ptr<const IPluginRequirement>>
+Form43Checker::requirements() const
+{
+  return {PluginRequirementFactory::gameDependency("Skyrim Special Edition")};
+}
+
+QList<PluginSetting> Form43Checker::settings() const
+{
+  return {};
+}
+
+std::vector<unsigned int> Form43Checker::activeProblems() const
+{
+  updateInvalidPlugins();
+  if (!m_invalidPlugins.isEmpty()) {
+    return {PROBLEM_FORM43};
+  }
+  return {};
+}
+
+QString Form43Checker::shortDescription(unsigned int key) const
+{
+  return tr("Form 43 (or lower) plugin detected");
+}
+
+QString Form43Checker::fullDescription(unsigned int key) const
+{
+  QStringList plugins = listPlugins();
+  QString pluginListString =
+      "<br><br>\u2022  " + plugins.join("<br>\u2022  ");
+
+  QString output = tr("You have one or more plugins that are not form 44. "
+                       "They are:%1")
+                       .arg(pluginListString);
+  output += "<br><br>";
+  output += tr(
+      "Form 43 (or lower) plugins are modules that were made for Skyrim LE "
+      "(Oldrim) and have not been properly ported to Skyrim Special Edition, "
+      "which uses form 44 plugins. This usually results in parts of the mod "
+      "not working correctly."
+      "<br><br>"
+      "To be converted, these plugins simply need to be opened and saved with "
+      "the SSE Creation Kit but their presence can be an indication that a mod "
+      "was not properly ported to SSE and so can potentially have additional "
+      "issues."
+      "<br><br>"
+      "Online guides can have more information on how to correctly convert mods "
+      "for Skyrim SE.<br>");
+  return output;
+}
+
+bool Form43Checker::hasGuidedFix(unsigned int key) const
+{
+  return false;
+}
+
+void Form43Checker::startGuidedFix(unsigned int key) const {}
+
+void Form43Checker::updateInvalidPlugins() const
+{
+  m_invalidPlugins.clear();
+  QStringList files = m_organizer->findFiles(
+      "", QStringList() << "*.esp" << "*.esm");
+  for (const QString& file : files) {
+    int ver = getFormVersion(file);
+    if (ver != -1 && ver < 44) {
+      m_invalidPlugins.append(file);
+    }
+  }
+}
+
+int Form43Checker::getFormVersion(const QString& file) const
+{
+  QString pluginName = QFileInfo(file).fileName();
+  return m_organizer->pluginList()->formVersion(pluginName);
+}
+
+QStringList Form43Checker::listPlugins() const
+{
+  QStringList result;
+  for (const QString& file : m_invalidPlugins) {
+    QString pluginName = QFileInfo(file).fileName();
+    int ver            = getFormVersion(file);
+    result.append(QString("%1 (form %2)").arg(pluginName).arg(ver));
+  }
+  return result;
+}
diff --git a/libs/form43_checker_native/src/form43checker.h b/libs/form43_checker_native/src/form43checker.h
new file mode 100644
index 0000000..583c7fa
--- /dev/null
+++ b/libs/form43_checker_native/src/form43checker.h
@@ -0,0 +1,53 @@
+#ifndef FORM43CHECKER_H
+#define FORM43CHECKER_H
+
+#include <memory>
+
+#include <QString>
+#include <QStringList>
+
+#include <uibase/iplugin.h>
+#include <uibase/iplugindiagnose.h>
+#include <uibase/pluginrequirements.h>
+
+class Form43Checker : public QObject,
+                      public MOBase::IPlugin,
+                      public MOBase::IPluginDiagnose
+{
+  Q_OBJECT
+  Q_INTERFACES(MOBase::IPlugin MOBase::IPluginDiagnose)
+  Q_PLUGIN_METADATA(IID "org.tannin.Form43CheckerNative")
+
+public:
+  Form43Checker();
+
+public:  // IPlugin
+  bool init(MOBase::IOrganizer* moInfo) override;
+  QString name() const override;
+  QString localizedName() const override;
+  QString author() const override;
+  QString description() const override;
+  MOBase::VersionInfo version() const override;
+  std::vector<std::shared_ptr<const MOBase::IPluginRequirement>>
+  requirements() const override;
+  QList<MOBase::PluginSetting> settings() const override;
+
+public:  // IPluginDiagnose
+  std::vector<unsigned int> activeProblems() const override;
+  QString shortDescription(unsigned int key) const override;
+  QString fullDescription(unsigned int key) const override;
+  bool hasGuidedFix(unsigned int key) const override;
+  void startGuidedFix(unsigned int key) const override;
+
+private:
+  static const unsigned int PROBLEM_FORM43 = 0;
+
+  void updateInvalidPlugins() const;
+  int getFormVersion(const QString& file) const;
+  QStringList listPlugins() const;
+
+  MOBase::IOrganizer* m_organizer;
+  mutable QStringList m_invalidPlugins;
+};
+
+#endif  // FORM43CHECKER_H