feat: entity move

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

shared/lib/Resource/Identifier/EntityIdentifier.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace KTXF\Resource\Identifier;
+
+/**
+ * Entity-level resource identifier (depth 4)
+ * 
+ * Format: {provider}:{service}:{collection}:{entity}
+ */
+class EntityIdentifier extends CollectionIdentifier implements EntityIdentifierInterface {
+
+	public function __construct(
+		string $provider,
+		string $service,
+		string $collection,
+		private readonly string $_entity,
+	) {
+		parent::__construct($provider, $service, $collection);
+	}
+
+	public function entity(): string {
+		return $this->_entity;
+	}
+
+	public function depth(): int {
+		return 4;
+	}
+
+	public function __toString(): string {
+		return parent::__toString() . self::SEPARATOR . $this->_entity;
+	}
+
+}