Add ShopModel and integrate with ProductModel

- Created ShopModel with fields for shop name, description, and user association.
- Updated ProductModel to include a foreign key relationship with ShopModel.
- Added admin interface for ShopModel with search functionality.
- Created migrations for ShopModel and its integration with ProductModel.

backend/account/migrations/0029_shopmodel.py

@@ -0,0 +1,28 @@
+# Generated by Django 5.1.2 on 2025-08-02 15:21
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('account', '0028_newsmodel_is_read'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ShopModel',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('shop_name', models.CharField(max_length=100, verbose_name='نام فروشگاه')),
+                ('shop_description', models.TextField(verbose_name='توضیحات فروشگاه')),
+                ('user', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='shop', to=settings.AUTH_USER_MODEL, verbose_name='کاربر')),
+            ],
+            options={
+                'verbose_name': 'فروشگاه',
+                'verbose_name_plural': 'فروشگاه ها',
+            },
+        ),
+    ]