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>

1 files changed, 53 insertions, 0 deletions

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