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/sebastian/diff/composer.json

@@ -0,0 +1,51 @@
+{
+    "name": "sebastian/diff",
+    "description": "Diff implementation",
+    "keywords": ["diff", "udiff", "unidiff", "unified diff"],
+    "homepage": "https://github.com/sebastianbergmann/diff",
+    "license": "BSD-3-Clause",
+    "authors": [
+        {
+            "name": "Sebastian Bergmann",
+            "email": "sebastian@phpunit.de"
+        },
+        {
+            "name": "Kore Nordmann",
+            "email": "mail@kore-nordmann.de"
+        }
+    ],
+    "support": {
+        "issues": "https://github.com/sebastianbergmann/diff/issues",
+        "security": "https://github.com/sebastianbergmann/diff/security/policy"
+    },
+    "prefer-stable": true,
+    "config": {
+        "platform": {
+            "php": "8.2.0"
+        },
+        "optimize-autoloader": true,
+        "sort-packages": true
+    },
+    "require": {
+        "php": ">=8.2"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^11.0",
+        "symfony/process": "^4.2 || ^5"
+    },
+    "autoload": {
+        "classmap": [
+            "src/"
+        ]
+    },
+    "autoload-dev": {
+        "classmap": [
+            "tests/"
+        ]
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-main": "6.0-dev"
+        }
+    }
+}