Add Quiz feature: 10-question quizzes with progressive scoring (max 40 pts)

- Quizzes table with questions, answer options, attempts, answers
- Question types: multiple_choice, exclusion, true_false, free_text
- Progressive scoring: [1,1,2,2,3,3,4,6,8,10] = max 40 per quiz
- Alpine.js countdown timer per question with auto-submit on timeout
- Admin: CRUD for quizzes + per-question editor, JSON export/import
- Child: quiz overview with best scores, question view, result breakdown
- Nav: Quiz link in child header and admin sidebar

resources/views/admin/quizzes/create.blade.php

@@ -0,0 +1,28 @@
+@extends('layouts.admin')
+@section('title','Neues Quiz')
+@section('content')
+<div class="max-w-xl">
+  <a href="{{ route('admin.quizzes.index') }}" class="text-sm text-slate-500 hover:text-slate-700 mb-4 inline-block">← Zurück</a>
+  <div class="bg-white rounded-xl shadow-sm border border-slate-200 p-6">
+    <h2 class="font-semibold text-slate-800 mb-5">Neues Quiz</h2>
+    <form method="POST" action="{{ route('admin.quizzes.store') }}" class="space-y-4">
+      @csrf
+      <div>
+        <label class="block text-sm font-medium text-slate-700 mb-1">Fach</label>
+        <select name="subject_id" required class="w-full border border-slate-300 rounded-lg px-3 py-2 text-sm focus:ring-2 focus:ring-violet-500 outline-none">
+          @foreach($subjects as $s)<option value="{{ $s->id }}">{{ $s->icon }} {{ $s->name }}</option>@endforeach
+        </select>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-700 mb-1">Titel</label>
+        <input name="title" required value="{{ old('title') }}" class="w-full border border-slate-300 rounded-lg px-3 py-2 text-sm focus:ring-2 focus:ring-violet-500 outline-none">
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-700 mb-1">Beschreibung (optional)</label>
+        <textarea name="description" rows="2" class="w-full border border-slate-300 rounded-lg px-3 py-2 text-sm focus:ring-2 focus:ring-violet-500 outline-none">{{ old('description') }}</textarea>
+      </div>
+      <button type="submit" class="w-full bg-violet-600 hover:bg-violet-700 text-white py-2 rounded-lg font-medium text-sm">Erstellen & Fragen hinzufügen →</button>
+    </form>
+  </div>
+</div>
+@endsection