fix structure product categories table and crud product

database/migrations/2025_06_02_095805_add_parent_id_to_product_categories_table.php

@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddParentIdToProductCategoriesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('product_categories', function (Blueprint $table) {
+            $table->foreignId('parent_id')->nullable()->after('name')->constrained('product_categories')->nullOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('product_categories', function (Blueprint $table) {
+            $table->dropForeign(['parent_id']);
+            $table->dropColumn('parent_id');
+        });
+    }
+}