Move examples to server directory (#198)

* move examples to server directory

This will prepare for the client implementation in https://github.com/modelcontextprotocol/php-sdk/pull/192

* fix move bootstrap too

examples/custom-dependencies/Service/TaskRepositoryInterface.php

@@ -1,35 +0,0 @@
-<?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\CustomDependencies\Service;
-
-/**
- * @phpstan-type Task array{id: int, userId: string, description: string, completed: bool, createdAt: string}
- */
-interface TaskRepositoryInterface
-{
-    /**
-     * @return Task
-     */
-    public function addTask(string $userId, string $description): array;
-
-    /**
-     * @return Task[]
-     */
-    public function getTasksForUser(string $userId): array;
-
-    /**
-     * @return Task[]
-     */
-    public function getAllTasks(): array;
-
-    public function completeTask(int $taskId): bool;
-}