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

database/migrations/2026_05_05_220000_create_quizzes_table.php

@@ -0,0 +1,38 @@
+<?php
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+return new class extends Migration {
+    public function up(): void {
+        Schema::create('quizzes', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('subject_id')->constrained()->cascadeOnDelete();
+            $table->string('title');
+            $table->text('description')->nullable();
+            $table->boolean('active')->default(true);
+            $table->timestamps();
+        });
+        Schema::create('quiz_questions', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('quiz_id')->constrained()->cascadeOnDelete();
+            $table->unsignedSmallInteger('sort_order')->default(0);
+            $table->enum('type', ['multiple_choice','exclusion','true_false','free_text']);
+            $table->text('question_text');
+            $table->unsignedSmallInteger('time_limit')->nullable();
+            $table->string('correct_answer')->nullable();
+            $table->timestamps();
+        });
+        Schema::create('quiz_answer_options', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('quiz_question_id')->constrained()->cascadeOnDelete();
+            $table->string('text');
+            $table->boolean('is_correct')->default(false);
+            $table->unsignedSmallInteger('sort_order')->default(0);
+        });
+    }
+    public function down(): void {
+        Schema::dropIfExists('quiz_answer_options');
+        Schema::dropIfExists('quiz_questions');
+        Schema::dropIfExists('quizzes');
+    }
+};