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>

assets/controllers.json

@@ -0,0 +1,18 @@
+{
+    "controllers": {
+        "@symfony/ux-turbo": {
+            "turbo-core": {
+                "enabled": true,
+                "fetch": "eager",
+                "autoimport": {
+                    "@symfony/ux-turbo/dist/mercure_stream_source_element.js": true
+                }
+            },
+            "mercure-turbo-stream": {
+                "enabled": false,
+                "fetch": "eager"
+            }
+        }
+    },
+    "entrypoints": []
+}