feat: entity move

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

shared/lib/Resource/Identifier/CollectionIdentifier.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace KTXF\Resource\Identifier;
+
+/**
+ * Collection-level resource identifier (depth 3)
+ * 
+ * Format: {provider}:{service}:{collection}
+ */
+class CollectionIdentifier extends ServiceIdentifier implements CollectionIdentifierInterface {
+
+	public function __construct(
+		string $provider,
+		string $service,
+		private readonly string $_collection,
+	) {
+		parent::__construct($provider, $service);
+	}
+
+	public function collection(): string {
+		return $this->_collection;
+	}
+
+	public function depth(): int {
+		return 3;
+	}
+
+	public function __toString(): string {
+		return parent::__toString() . self::SEPARATOR . $this->_collection;
+	}
+
+}