init: add source code from src.zip

src/utils/nativeInstaller/index.ts

@@ -0,0 +1,18 @@
+/**
+ * Native Installer - Public API
+ *
+ * This is the barrel file that exports only the functions actually used by external modules.
+ * External modules should only import from this file.
+ */
+
+// Re-export only the functions that are actually used
+export {
+  checkInstall,
+  cleanupNpmInstallations,
+  cleanupOldVersions,
+  cleanupShellAliases,
+  installLatest,
+  lockCurrentVersion,
+  removeInstalledSymlink,
+  type SetupMessage,
+} from './installer.js'