refactor sitemap generation and navigation handling; remove old GenerateSitemap command, update to use tasks for better organization, and enhance navigation data retrieval

app/Containers/AppStructure/Tasks/GetDepartmentsForSitemapTask.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Containers\AppStructure\Tasks;
+
+use App\Containers\InstituteStructure\Models\Department;
+
+class GetDepartmentsForSitemapTask
+{
+    public function run()
+    {
+        return Department::query()
+            ->where('is_active', true)
+            ->with('faculty')
+            ->get();
+    }
+}