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/brick/math/composer.json

@@ -0,0 +1,39 @@
+{
+    "name": "brick/math",
+    "description": "Arbitrary-precision arithmetic library",
+    "type": "library",
+    "keywords": [
+        "Brick",
+        "Math",
+        "Mathematics",
+        "Arbitrary-precision",
+        "Arithmetic",
+        "BigInteger",
+        "BigDecimal",
+        "BigRational",
+        "BigNumber",
+        "Bignum",
+        "Decimal",
+        "Rational",
+        "Integer"
+    ],
+    "license": "MIT",
+    "require": {
+        "php": "^8.2"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^11.5",
+        "php-coveralls/php-coveralls": "^2.2",
+        "phpstan/phpstan": "2.1.22"
+    },
+    "autoload": {
+        "psr-4": {
+            "Brick\\Math\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Brick\\Math\\Tests\\": "tests/"
+        }
+    }
+}