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/explicit-registration/SimpleHandlers.php

@@ -1,81 +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\ExplicitRegistration;
-
-use Psr\Log\LoggerInterface;
-
-final class SimpleHandlers
-{
-    private string $appVersion = '1.0-manual';
-
-    public function __construct(
-        private readonly LoggerInterface $logger,
-    ) {
-        $this->logger->info('SimpleHandlers instantiated for manual registration example.');
-    }
-
-    /**
-     * A manually registered tool to echo input.
-     *
-     * @param string $text the text to echo
-     *
-     * @return string the echoed text
-     */
-    public function echoText(string $text): string
-    {
-        $this->logger->info("Manual tool 'echo_text' called.", ['text' => $text]);
-
-        return 'Echo: '.$text;
-    }
-
-    /**
-     * A manually registered resource providing app version.
-     *
-     * @return string the application version
-     */
-    public function getAppVersion(): string
-    {
-        $this->logger->info("Manual resource 'app://version' read.");
-
-        return $this->appVersion;
-    }
-
-    /**
-     * A manually registered prompt template.
-     *
-     * @param string $userName the name of the user
-     *
-     * @return array<string, string>[] the prompt messages
-     */
-    public function greetingPrompt(string $userName): array
-    {
-        $this->logger->info("Manual prompt 'personalized_greeting' called.", ['userName' => $userName]);
-
-        return [
-            ['role' => 'user', 'content' => "Craft a personalized greeting for {$userName}."],
-        ];
-    }
-
-    /**
-     * A manually registered resource template.
-     *
-     * @param string $itemId the ID of the item
-     *
-     * @return array<string, string> item details
-     */
-    public function getItemDetails(string $itemId): array
-    {
-        $this->logger->info("Manual template 'item://{itemId}' resolved.", ['itemId' => $itemId]);
-
-        return ['id' => $itemId, 'name' => "Item {$itemId}", 'description' => "Details for item {$itemId} from manual template."];
-    }
-}