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/symfony/polyfill-php83/README.md

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+Symfony Polyfill / Php83
+========================
+
+This component provides features added to PHP 8.3 core:
+
+- [`json_validate`](https://wiki.php.net/rfc/json_validate)
+- [`Override`](https://wiki.php.net/rfc/marking_overriden_methods)
+- [`mb_str_pad`](https://wiki.php.net/rfc/mb_str_pad)
+- [`ldap_exop_sync`](https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures)
+- [`ldap_connect_wallet`](https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures)
+- [`stream_context_set_options`](https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures)
+- [`str_increment` and `str_decrement`](https://wiki.php.net/rfc/saner-inc-dec-operators)
+- [`Date*Exception/Error classes`](https://wiki.php.net/rfc/datetime-exceptions)
+- [`SQLite3Exception`](https://wiki.php.net/rfc/sqlite3_exceptions)
+
+More information can be found in the
+[main Polyfill README](https://github.com/symfony/polyfill/blob/main/README.md).
+
+License
+=======
+
+This library is released under the [MIT license](LICENSE).