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/ShellExec.php

@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node\Expr;
+
+use PhpParser\Node\Expr;
+use PhpParser\Node\InterpolatedStringPart;
+
+class ShellExec extends Expr {
+    /** @var (Expr|InterpolatedStringPart)[] Interpolated string array */
+    public array $parts;
+
+    /**
+     * Constructs a shell exec (backtick) node.
+     *
+     * @param (Expr|InterpolatedStringPart)[] $parts Interpolated string array
+     * @param array<string, mixed> $attributes Additional attributes
+     */
+    public function __construct(array $parts, array $attributes = []) {
+        $this->attributes = $attributes;
+        $this->parts = $parts;
+    }
+
+    public function getSubNodeNames(): array {
+        return ['parts'];
+    }
+
+    public function getType(): string {
+        return 'Expr_ShellExec';
+    }
+}