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>

app/Services/InvitationService.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace App\Services;
+
+use App\Enums\UserRole;
+use App\Models\Invitation;
+use App\Models\User;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Hash;
+
+class InvitationService
+{
+    public function createInvitation(array $data, User $admin): Invitation
+    {
+        $rawToken = bin2hex(random_bytes(32));
+
+        $invitation = new Invitation([
+            'email' => $data['email'] ?? null,
+            'expires_at' => now()->addDays((int) ($data['expires_in_days'] ?? 7)),
+            'created_at' => now(),
+        ]);
+        // Token gehasht speichern — Klartext nur in der URL (V05)
+        $invitation->token = hash('sha256', $rawToken);
+        $invitation->created_by = $admin->id;
+        $invitation->save();
+
+        if (!empty($data['player_ids'])) {
+            $invitation->players()->attach($data['player_ids']);
+        }
+
+        // raw_token für die URL-Generierung bereitstellen (nicht persistiert)
+        $invitation->raw_token = $rawToken;
+
+        return $invitation;
+    }
+
+    public function redeemInvitation(Invitation $invitation, array $userData): User
+    {
+        return DB::transaction(function () use ($invitation, $userData) {
+            $user = User::create([
+                'name' => $userData['name'],
+                'email' => $userData['email'],
+                'password' => $userData['password'],
+            ]);
+            $user->is_active = true;
+            $user->role = UserRole::User;
+            $user->save();
+
+            // Eltern-Kind-Zuordnungen aus der Einladung übernehmen
+            foreach ($invitation->players as $player) {
+                $user->children()->attach($player->id, [
+                    'created_at' => now(),
+                ]);
+            }
+
+            $invitation->accepted_at = now();
+            $invitation->save();
+
+            return $user;
+        });
+    }
+}