add set elements

backend/database/migrations/2026_05_24_000000_sets_table.php

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+<?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('sets', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('sets');
+    }
+};

backend/database/migrations/2026_05_24_000001_elements_table.php

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+<?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('elements', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('set_id')->constrained('sets');
+            $table->string('title');
+            $table->foreignId('parent_element_id')
+                ->nullable()
+                ->constrained('elements');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('elements');
+    }
+};