fix: products 테이블 category_id 기본값 0 설정

- category_id 필드에 기본값이 없어 INSERT 오류 발생하던 문제 해결

database/migrations/2025_12_02_163035_alter_products_table_set_category_id_default.php

@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('products', function (Blueprint $table) {
+            $table->unsignedBigInteger('category_id')->default(0)->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('products', function (Blueprint $table) {
+            $table->unsignedBigInteger('category_id')->default(null)->change();
+        });
+    }
+};