Adopt server examples

examples/06-custom-dependencies-stdio/Service/TaskRepositoryInterface.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Example\DependenciesStdioExample\Service;
+
+interface TaskRepositoryInterface
+{
+    public function addTask(string $userId, string $description): array;
+
+    public function getTasksForUser(string $userId): array;
+
+    public function getAllTasks(): array;
+
+    public function completeTask(int $taskId): bool;
+}