Move plugins to manifest, pin Docker version, add Makefile

- Add plugins.txt listing all plugins for reproducible installs
- Add Makefile with setup/start/stop/install-plugins targets
- Remove user/plugins/ from git tracking
- Pin Docker image to 1.7.49.5-ls244

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/email/vendor/symfony/mime/DependencyInjection/AddMimeTypeGuesserPass.php

@@ -1,50 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Mime\DependencyInjection;
-
-use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Reference;
-
-/**
- * Registers custom mime types guessers.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- */
-class AddMimeTypeGuesserPass implements CompilerPassInterface
-{
-    private $mimeTypesService;
-    private $mimeTypeGuesserTag;
-
-    public function __construct(string $mimeTypesService = 'mime_types', string $mimeTypeGuesserTag = 'mime.mime_type_guesser')
-    {
-        if (0 < \func_num_args()) {
-            trigger_deprecation('symfony/mime', '5.3', 'Configuring "%s" is deprecated.', __CLASS__);
-        }
-
-        $this->mimeTypesService = $mimeTypesService;
-        $this->mimeTypeGuesserTag = $mimeTypeGuesserTag;
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function process(ContainerBuilder $container)
-    {
-        if ($container->has($this->mimeTypesService)) {
-            $definition = $container->findDefinition($this->mimeTypesService);
-            foreach ($container->findTaggedServiceIds($this->mimeTypeGuesserTag, true) as $id => $attributes) {
-                $definition->addMethodCall('registerGuesser', [new Reference($id)]);
-            }
-        }
-    }
-}