Add native Root Builder and OMOD Installer plugins

- libs/rootbuilder_native/: Native C++ port of rootbuilder.py (IPluginTool)
  - Root/ dir scanning, copy (reflink/CoW) and symlink modes
  - JSON manifest tracking, backup/restore, auto-deploy hooks
  - Legacy migration and third-party conflict detection
- libs/installer_omod_native/: Native C++ port of installer_omod.py
  - Handles .omod archives (Oblivion Mod Manager format)
  - Binary config parsing, .NET string format, CRC file parsing
  - zlib raw deflate and LZMA decompression
  - Repackages to zip for MO2's installation manager
- Added both to build-inner.sh plugin packaging

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

1 files changed, 101 insertions, 0 deletions

diff --git a/libs/installer_omod_native/src/omodinstaller.h b/libs/installer_omod_native/src/omodinstaller.h
new file mode 100644
index 0000000..de48b77
--- /dev/null
+++ b/libs/installer_omod_native/src/omodinstaller.h
@@ -0,0 +1,101 @@
+#ifndef OMODINSTALLER_H
+#define OMODINSTALLER_H
+
+#include <uibase/iplugininstallercustom.h>
+
+#include <QByteArray>
+#include <QList>
+#include <QString>
+
+#include <cstdint>
+#include <vector>
+
+class OmodInstaller : public MOBase::IPluginInstallerCustom
+{
+  Q_OBJECT
+  Q_INTERFACES(MOBase::IPlugin MOBase::IPluginInstaller MOBase::IPluginInstallerCustom)
+  Q_PLUGIN_METADATA(IID "com.tannin.ModOrganizer.PluginInstallerCustom/1.0")
+
+public:
+  OmodInstaller();
+
+  // IPlugin
+  bool init(MOBase::IOrganizer* organizer) override;
+  QString name() const override;
+  QString localizedName() const override;
+  QString author() const override;
+  QString description() const override;
+  MOBase::VersionInfo version() const override;
+  QList<MOBase::PluginSetting> settings() const override;
+
+  // IPluginInstaller
+  unsigned int priority() const override;
+  bool isManualInstaller() const override;
+  bool isArchiveSupported(std::shared_ptr<const MOBase::IFileTree> tree) const override;
+
+  // IPluginInstallerCustom
+  bool isArchiveSupported(const QString& archiveName) const override;
+  std::set<QString> supportedExtensions() const override;
+  EInstallResult install(MOBase::GuessedValue<QString>& modName, QString gameName,
+                         const QString& archiveName, const QString& version,
+                         int nexusID) override;
+
+private:
+  MOBase::IOrganizer* m_organizer = nullptr;
+
+  // OMOD config parsed from the binary "config" entry.
+  struct OmodConfig
+  {
+    uint8_t fileVersion = 0;
+    QString modName;
+    int32_t major = 0;
+    int32_t minor = 0;
+    QString authorName;
+    QString email;
+    QString website;
+    QString desc;
+    uint8_t compressionType = 0;  // 0 = deflate, 1 = lzma
+  };
+
+  // Entry from data.crc / plugins.crc.
+  struct CrcEntry
+  {
+    QString path;
+    uint32_t crc = 0;
+    int64_t size = 0;
+  };
+
+  // Binary reader helper over a QByteArray.
+  class BinaryReader
+  {
+  public:
+    explicit BinaryReader(const QByteArray& data);
+
+    uint8_t readByte();
+    int32_t readInt32LE();
+    uint32_t readUInt32LE();
+    int64_t readInt64LE();
+    void skip(int bytes);
+    int read7BitEncodedInt();
+    QString readNetString();
+    QByteArray readBytes(int count);
+    bool atEnd() const;
+
+  private:
+    const QByteArray& m_data;
+    int m_pos = 0;
+  };
+
+  OmodConfig parseConfig(const QByteArray& data);
+  std::vector<CrcEntry> parseCrcFile(const QByteArray& data);
+  QByteArray decompressStream(const QByteArray& data, uint8_t compressionType);
+
+  EInstallResult doInstall(MOBase::GuessedValue<QString>& modName,
+                           const QString& archiveName);
+
+  void extractStream(const QString& omodDir, const QString& streamName,
+                     const QString& crcName, uint8_t compressionType,
+                     const QString& outDir);
+};
+
+#endif  // OMODINSTALLER_H