Stand: SMTP-Test, Admin-Mail-Tab, Notifiable-Fix, Lazy-Quill

- Fix: Notifiable-Trait zum User-Model hinzugefuegt (behebt notify()-500er)
- Installer: SMTP-Verbindungstest mit EsmtpTransport + Ueberspringen-Link
- Admin: Neuer E-Mail-Tab mit SMTP-Konfiguration + Verbindungstest
- Admin: Lazy Quill-Initialisierung (nur sichtbare Locale wird geladen)
- Uebersetzungen: 17 neue Mail-Keys in allen 6 Sprachen

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

vendor/symfony/mailer/composer.json

@@ -0,0 +1,47 @@
+{
+    "name": "symfony/mailer",
+    "type": "library",
+    "description": "Helps sending emails",
+    "keywords": [],
+    "homepage": "https://symfony.com",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Fabien Potencier",
+            "email": "fabien@symfony.com"
+        },
+        {
+            "name": "Symfony Community",
+            "homepage": "https://symfony.com/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=8.2",
+        "egulias/email-validator": "^2.1.10|^3|^4",
+        "psr/event-dispatcher": "^1",
+        "psr/log": "^1|^2|^3",
+        "symfony/event-dispatcher": "^6.4|^7.0|^8.0",
+        "symfony/mime": "^7.2|^8.0",
+        "symfony/service-contracts": "^2.5|^3"
+    },
+    "require-dev": {
+        "symfony/console": "^6.4|^7.0|^8.0",
+        "symfony/http-client": "^6.4|^7.0|^8.0",
+        "symfony/messenger": "^6.4|^7.0|^8.0",
+        "symfony/twig-bridge": "^6.4|^7.0|^8.0"
+    },
+    "conflict": {
+        "symfony/http-client-contracts": "<2.5",
+        "symfony/http-kernel": "<6.4",
+        "symfony/messenger": "<6.4",
+        "symfony/mime": "<6.4",
+        "symfony/twig-bridge": "<6.4"
+    },
+    "autoload": {
+        "psr-4": { "Symfony\\Component\\Mailer\\": "" },
+        "exclude-from-classmap": [
+            "/Tests/"
+        ]
+    },
+    "minimum-stability": "dev"
+}