some first models of pos & add required to attributes

apps/product/migrations/0053_attribute_required.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0 on 2025-07-21 06:06
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('product', '0052_remove_productstats_total_quota_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='attribute',
+            name='required',
+            field=models.BooleanField(default=False),
+        ),
+    ]