Scaffold Symfony 8 app with Bootstrap/DataTables and Docker stack

- Symfony 8.1 webapp skeleton on PHP 8.5 (AssetMapper/importmap, no Node)
- Form-login gate: User entity, security.yaml, SecurityController,
  app:user:create command, initial migration (user + messenger_messages)
- Bootstrap 5 + DataTables layout (base/login/home templates); any
  table.datatable is auto-initialised
- trusted_proxies/headers wired for the shared Nginx Proxy Manager
- Docker (servers only): docker-compose.yml (php:8.5-fpm-alpine,
  nginx:1.30-alpine, mariadb:12.3; host ports 8085/3310; external
  docker_default network) + docker/{Dockerfile,php.ini,nginx,setup.sh,restart.sh}
- .env with CHANGEME placeholders (no secrets), .gitattributes enforces
  LF so the deploy scripts stay runnable on Linux

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

migrations/Version20260906115952.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Initial schema: `user` (form-login) and `messenger_messages` (async transport).
+ */
+final class Version20260906115952 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Initial schema: user and messenger_messages tables';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE TABLE `user` (id INT AUTO_INCREMENT NOT NULL, email VARCHAR(180) NOT NULL, roles JSON NOT NULL, password VARCHAR(255) NOT NULL, UNIQUE INDEX UNIQ_8D93D649E7927C74 (email), PRIMARY KEY (id)) DEFAULT CHARACTER SET utf8mb4');
+        $this->addSql('CREATE TABLE messenger_messages (id BIGINT AUTO_INCREMENT NOT NULL, body LONGTEXT NOT NULL, headers LONGTEXT NOT NULL, queue_name VARCHAR(190) NOT NULL, created_at DATETIME NOT NULL, available_at DATETIME NOT NULL, delivered_at DATETIME DEFAULT NULL, INDEX IDX_75EA56E0FB7336F0E3BD61CE16BA31DBBF396750 (queue_name, available_at, delivered_at, id), PRIMARY KEY (id)) DEFAULT CHARACTER SET utf8mb4');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP TABLE `user`');
+        $this->addSql('DROP TABLE messenger_messages');
+    }
+}