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/laravel/framework/src/Illuminate/Broadcasting/FakePendingBroadcast.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Illuminate\Broadcasting;
+
+class FakePendingBroadcast extends PendingBroadcast
+{
+    /**
+     * Create a new pending broadcast instance.
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Broadcast the event using a specific broadcaster.
+     *
+     * @param  string|null  $connection
+     * @return $this
+     */
+    public function via($connection = null)
+    {
+        return $this;
+    }
+
+    /**
+     * Broadcast the event to everyone except the current user.
+     *
+     * @return $this
+     */
+    public function toOthers()
+    {
+        return $this;
+    }
+
+    /**
+     * Handle the object's destruction.
+     *
+     * @return void
+     */
+    public function __destruct()
+    {
+        //
+    }
+}