refactor(modules): extract castopod parts into a modules/ folder for a scalable HMVC structure

- create Admin, Analytics, Auth, Fediverse and Install modules in the root modules/ folder
- rename
ActivityPub to Fediverse

modules/Fediverse/Objects/OrderedCollectionObject.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This class defines a Paginated OrderedCollection based on CodeIgniter4 Pager to get the pagination metadata
+ *
+ * @copyright  2021 Podlibre
+ * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
+ * @link       https://castopod.org/
+ */
+
+namespace Modules\Fediverse\Objects;
+
+use CodeIgniter\Pager\Pager;
+use Modules\Fediverse\Core\ObjectType;
+
+class OrderedCollectionObject extends ObjectType
+{
+    protected string $type = 'OrderedCollection';
+
+    protected int $totalItems;
+
+    protected ?string $first = null;
+
+    protected ?string $current = null;
+
+    protected ?string $last = null;
+
+    /**
+     * @param ObjectType[]|null $orderedItems
+     */
+    public function __construct(
+        protected ?array $orderedItems = null,
+        ?Pager $pager = null
+    ) {
+        $this->id = current_url();
+
+        if ($pager !== null) {
+            $totalItems = $pager->getTotal();
+            $this->totalItems = $totalItems;
+
+            if ($totalItems !== 0) {
+                $this->first = $pager->getPageURI($pager->getFirstPage());
+                $this->current = $pager->getPageURI();
+                $this->last = $pager->getPageURI($pager->getLastPage());
+            }
+        }
+    }
+}