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/league/uri-interfaces/IPv4/GMPCalculator.php

@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * League.Uri (https://uri.thephpleague.com)
+ *
+ * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\Uri\IPv4;
+
+use GMP;
+
+use function gmp_add;
+use function gmp_cmp;
+use function gmp_div_q;
+use function gmp_init;
+use function gmp_mod;
+use function gmp_mul;
+use function gmp_pow;
+use function gmp_sub;
+
+use const GMP_ROUND_MINUSINF;
+
+final class GMPCalculator implements Calculator
+{
+    public function baseConvert(mixed $value, int $base): GMP
+    {
+        return gmp_init($value, $base);
+    }
+
+    public function pow(mixed $value, int $exponent): GMP
+    {
+        return gmp_pow($value, $exponent);
+    }
+
+    public function compare(mixed $value1, mixed $value2): int
+    {
+        return gmp_cmp($value1, $value2);
+    }
+
+    public function multiply(mixed $value1, mixed $value2): GMP
+    {
+        return gmp_mul($value1, $value2);
+    }
+
+    public function div(mixed $value, mixed $base): GMP
+    {
+        return gmp_div_q($value, $base, GMP_ROUND_MINUSINF);
+    }
+
+    public function mod(mixed $value, mixed $base): GMP
+    {
+        return gmp_mod($value, $base);
+    }
+
+    public function add(mixed $value1, mixed $value2): GMP
+    {
+        return gmp_add($value1, $value2);
+    }
+
+    public function sub(mixed $value1, mixed $value2): GMP
+    {
+        return gmp_sub($value1, $value2);
+    }
+}