Initial commit: webtrees Family Navigator Graph sidebar module

SVG-based sidebar widget displaying immediate family relationships
(parents, siblings, spouses, children) with compact card layout,
multi-spouse routing, wrapped rows, and ancestor/descendant indicators.

module.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Family Navigator Graph module for webtrees.
+ *
+ * @license GPL-3.0-or-later
+ */
+
+declare(strict_types=1);
+
+namespace FamilyNavGraph;
+
+use Composer\Autoload\ClassLoader;
+use Fisharebest\Webtrees\Registry;
+
+// Register PSR-4 autoloader for our namespace
+$loader = new ClassLoader();
+$loader->addPsr4('FamilyNavGraph\\', __DIR__ . '/src');
+$loader->register();
+
+return Registry::container()->get(Module::class);