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/egulias/email-validator/composer.json

@@ -0,0 +1,37 @@
+{
+  "name":        "egulias/email-validator",
+  "description": "A library for validating emails against several RFCs",
+  "homepage":    "https://github.com/egulias/EmailValidator",
+  "keywords":    ["email", "validation", "validator", "emailvalidation", "emailvalidator"],
+  "license":     "MIT",
+  "authors": [
+    {"name": "Eduardo Gulias Davis"}
+  ],
+  "extra": {
+    "branch-alias": {
+      "dev-master": "4.0.x-dev"
+    }
+  },
+  "require": {
+    "php": ">=8.1",
+    "doctrine/lexer": "^2.0 || ^3.0",
+    "symfony/polyfill-intl-idn": "^1.26"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^10.2",
+    "vimeo/psalm": "^5.12"
+  },
+  "suggest": {
+    "ext-intl": "PHP Internationalization Libraries are required to use the SpoofChecking validation"
+  },
+  "autoload": {
+    "psr-4": {
+      "Egulias\\EmailValidator\\": "src"
+    }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Egulias\\EmailValidator\\Tests\\": "tests"
+    }
+  }
+}