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/complex-tool-schema/server.php

@@ -1,29 +0,0 @@
-#!/usr/bin/env php
-<?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.
- */
-
-require_once dirname(__DIR__).'/bootstrap.php';
-chdir(__DIR__);
-
-use Mcp\Server;
-use Mcp\Server\Session\FileSessionStore;
-
-$server = Server::builder()
-    ->setServerInfo('Event Scheduler Server', '1.0.0')
-    ->setLogger(logger())
-    ->setContainer(container())
-    ->setSession(new FileSessionStore(__DIR__.'/sessions'))
-    ->setDiscovery(__DIR__)
-    ->build();
-
-$response = $server->run(transport());
-
-shutdown($response);