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/flysystem/src/FilesystemWriter.php

@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace League\Flysystem;
+
+interface FilesystemWriter
+{
+    /**
+     * @throws UnableToWriteFile
+     * @throws FilesystemException
+     */
+    public function write(string $location, string $contents, array $config = []): void;
+
+    /**
+     * @param mixed $contents
+     *
+     * @throws UnableToWriteFile
+     * @throws FilesystemException
+     */
+    public function writeStream(string $location, $contents, array $config = []): void;
+
+    /**
+     * @throws UnableToSetVisibility
+     * @throws FilesystemException
+     */
+    public function setVisibility(string $path, string $visibility): void;
+
+    /**
+     * @throws UnableToDeleteFile
+     * @throws FilesystemException
+     */
+    public function delete(string $location): void;
+
+    /**
+     * @throws UnableToDeleteDirectory
+     * @throws FilesystemException
+     */
+    public function deleteDirectory(string $location): void;
+
+    /**
+     * @throws UnableToCreateDirectory
+     * @throws FilesystemException
+     */
+    public function createDirectory(string $location, array $config = []): void;
+
+    /**
+     * @throws UnableToMoveFile
+     * @throws FilesystemException
+     */
+    public function move(string $source, string $destination, array $config = []): void;
+
+    /**
+     * @throws UnableToCopyFile
+     * @throws FilesystemException
+     */
+    public function copy(string $source, string $destination, array $config = []): void;
+}