Adopt server examples

examples/06-custom-dependencies-stdio/Service/SystemStatsService.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;
+
+class SystemStatsService implements StatsServiceInterface
+{
+    private TaskRepositoryInterface $taskRepository;
+
+    public function __construct(TaskRepositoryInterface $taskRepository)
+    {
+        $this->taskRepository = $taskRepository;
+    }
+
+    public function getSystemStats(): array
+    {
+        $allTasks = $this->taskRepository->getAllTasks();
+        $completed = \count(array_filter($allTasks, fn ($task) => $task['completed']));
+        $pending = \count($allTasks) - $completed;
+
+        return [
+            'total_tasks' => \count($allTasks),
+            'completed_tasks' => $completed,
+            'pending_tasks' => $pending,
+            'server_uptime_seconds' => time() - $_SERVER['REQUEST_TIME_FLOAT'], // Approx uptime for CLI script
+        ];
+    }
+}