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>

templates/security/login.html.twig

@@ -0,0 +1,44 @@
+{% extends 'base.html.twig' %}
+
+{% block title %}Sign in · dmtools{% endblock %}
+
+{% block navbar %}
+    <nav class="navbar bg-body-tertiary border-bottom">
+        <div class="container">
+            <span class="navbar-brand">🎲 dmtools</span>
+        </div>
+    </nav>
+{% endblock %}
+
+{% block body %}
+    <div class="card login-card shadow-sm">
+        <div class="card-body p-4">
+            <h1 class="h4 mb-3 text-center">Sign in</h1>
+
+            <form method="post">
+                {% if error %}
+                    <div class="alert alert-danger" role="alert">
+                        {{ error.messageKey|trans(error.messageData, 'security') }}
+                    </div>
+                {% endif %}
+
+                <div class="mb-3">
+                    <label for="username" class="form-label">Email</label>
+                    <input type="email" value="{{ last_username }}" name="_username" id="username"
+                           class="form-control" autocomplete="email" required autofocus>
+                </div>
+
+                <div class="mb-3">
+                    <label for="password" class="form-label">Password</label>
+                    <input type="password" name="_password" id="password"
+                           class="form-control" autocomplete="current-password" required>
+                </div>
+
+                <input type="hidden" name="_csrf_token" data-controller="csrf-protection"
+                       value="{{ csrf_token('authenticate') }}">
+
+                <button class="btn btn-primary w-100" type="submit">Sign in</button>
+            </form>
+        </div>
+    </div>
+{% endblock %}