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/Auth/GuardHelpers.php

@@ -0,0 +1,124 @@
+<?php
+
+namespace Illuminate\Auth;
+
+use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
+use Illuminate\Contracts\Auth\UserProvider;
+
+/**
+ * These methods are typically the same across all guards.
+ */
+trait GuardHelpers
+{
+    /**
+     * The currently authenticated user.
+     *
+     * @var \Illuminate\Contracts\Auth\Authenticatable|null
+     */
+    protected $user;
+
+    /**
+     * The user provider implementation.
+     *
+     * @var \Illuminate\Contracts\Auth\UserProvider
+     */
+    protected $provider;
+
+    /**
+     * Determine if the current user is authenticated. If not, throw an exception.
+     *
+     * @return \Illuminate\Contracts\Auth\Authenticatable
+     *
+     * @throws \Illuminate\Auth\AuthenticationException
+     */
+    public function authenticate()
+    {
+        return $this->user() ?? throw new AuthenticationException;
+    }
+
+    /**
+     * Determine if the guard has a user instance.
+     *
+     * @return bool
+     */
+    public function hasUser()
+    {
+        return ! is_null($this->user);
+    }
+
+    /**
+     * Determine if the current user is authenticated.
+     *
+     * @return bool
+     */
+    public function check()
+    {
+        return ! is_null($this->user());
+    }
+
+    /**
+     * Determine if the current user is a guest.
+     *
+     * @return bool
+     */
+    public function guest()
+    {
+        return ! $this->check();
+    }
+
+    /**
+     * Get the ID for the currently authenticated user.
+     *
+     * @return int|string|null
+     */
+    public function id()
+    {
+        return $this->user()?->getAuthIdentifier();
+    }
+
+    /**
+     * Set the current user.
+     *
+     * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
+     * @return $this
+     */
+    public function setUser(AuthenticatableContract $user)
+    {
+        $this->user = $user;
+
+        return $this;
+    }
+
+    /**
+     * Forget the current user.
+     *
+     * @return $this
+     */
+    public function forgetUser()
+    {
+        $this->user = null;
+
+        return $this;
+    }
+
+    /**
+     * Get the user provider used by the guard.
+     *
+     * @return \Illuminate\Contracts\Auth\UserProvider
+     */
+    public function getProvider()
+    {
+        return $this->provider;
+    }
+
+    /**
+     * Set the user provider used by the guard.
+     *
+     * @param  \Illuminate\Contracts\Auth\UserProvider  $provider
+     * @return void
+     */
+    public function setProvider(UserProvider $provider)
+    {
+        $this->provider = $provider;
+    }
+}