Plugin sidebar order + directory layout from index.md

- PluginManager: iterate allowedPlugins in user-defined order (frontmatter order)
- content-edit.twig: plugin list with up/down arrows to set order
- Directory listing: read layout/plugins from index.md if present
- Directory default layout: full_content (no sidebar) unless index.md says otherwise

cms/core/class/CodePressCMS.php

@@ -1141,9 +1141,22 @@ class CodePressCMS {
             $content .= '<p>' . $this->t('directory_empty') . '.</p>';
         }
         
+        // Check for index.md in this directory for layout/plugins metadata
+        $indexFile = $dirPath . '/index.md';
+        $layout = 'full_content';
+        $metadata = [];
+        if (file_exists($indexFile)) {
+            $indexContent = file_get_contents($indexFile);
+            $parsed = $this->parseMetadata($indexContent);
+            $metadata = $parsed['metadata'];
+            $layout = $metadata['layout'] ?? 'full_content';
+        }
+        
         return [
             'title' => $title,
-            'content' => $content
+            'content' => $content,
+            'layout' => $layout,
+            'metadata' => $metadata,
         ];
     }