add suffix to internals folder

scripts/extract-elx/extract-elx.js

@@ -74,7 +74,8 @@ const CONFIG = {
   JSON_INDENT: 2,
   MANIFEST_FILE: '_manifest.json',
   INDEX_FILE: 'index',
-  ITEM_PREFIX: 'item'
+  ITEM_PREFIX: 'item',
+  INTERNALS_SUFFIX: '_internals'
 };
 
 // ============================================================================
@@ -627,7 +628,7 @@ async function main() {
     // Determine output directory
     const dir = path.dirname(inputPath);
     const basename = path.basename(inputPath, path.extname(inputPath));
-    const outputPath = path.join(dir, basename);
+    const outputPath = path.join(dir, `${basename}${CONFIG.INTERNALS_SUFFIX}`);
 
     console.log('\n📁 ElixForms JSON Extractor\n');
     console.log(`📖 Reading: ${inputPath}`);