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/Http/Controllers/Admin/InvitationController.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use App\Models\ActivityLog;
+use App\Models\Invitation;
+use App\Models\Player;
+use App\Services\InvitationService;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
+
+class InvitationController extends Controller
+{
+    public function __construct(private InvitationService $invitationService) {}
+
+    public function index(): View
+    {
+        $invitations = Invitation::with(['creator', 'players.team'])
+            ->latest('created_at')
+            ->paginate(20);
+
+        return view('admin.invitations.index', compact('invitations'));
+    }
+
+    public function create(): View
+    {
+        $players = Player::with('team')->active()->orderBy('last_name')->get();
+
+        return view('admin.invitations.create', compact('players'));
+    }
+
+    public function store(Request $request): RedirectResponse
+    {
+        $validated = $request->validate([
+            'email' => ['nullable', 'email', 'max:255'],
+            'expires_in_days' => ['required', 'integer', 'min:1', 'max:90'],
+            'player_ids' => ['nullable', 'array'],
+            'player_ids.*' => ['exists:players,id'],
+        ]);
+
+        $invitation = $this->invitationService->createInvitation($validated, $request->user());
+
+        $link = route('register', $invitation->raw_token);
+
+        ActivityLog::logWithChanges('created', __('admin.log_invitation_created', ['email' => $validated['email'] ?? '–']), 'User', null, null, ['email' => $validated['email'] ?? '–']);
+
+        return redirect()->route('admin.invitations.index')
+            ->with('success', __('admin.invitation_created', ['link' => $link]));
+    }
+
+    public function destroy(Invitation $invitation): RedirectResponse
+    {
+        if ($invitation->isAccepted()) {
+            return back()->with('error', __('admin.invitation_already_used'));
+        }
+
+        $invitation->delete();
+
+        return back()->with('success', __('admin.invitation_deleted'));
+    }
+}