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/nikic/php-parser/lib/PhpParser/Node/Expr/NullsafePropertyFetch.php

@@ -0,0 +1,35 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node\Expr;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Identifier;
+
+class NullsafePropertyFetch extends Expr {
+    /** @var Expr Variable holding object */
+    public Expr $var;
+    /** @var Identifier|Expr Property name */
+    public Node $name;
+
+    /**
+     * Constructs a nullsafe property fetch node.
+     *
+     * @param Expr $var Variable holding object
+     * @param string|Identifier|Expr $name Property name
+     * @param array<string, mixed> $attributes Additional attributes
+     */
+    public function __construct(Expr $var, $name, array $attributes = []) {
+        $this->attributes = $attributes;
+        $this->var = $var;
+        $this->name = \is_string($name) ? new Identifier($name) : $name;
+    }
+
+    public function getSubNodeNames(): array {
+        return ['var', 'name'];
+    }
+
+    public function getType(): string {
+        return 'Expr_NullsafePropertyFetch';
+    }
+}