Fix Product filtering and add kit disassembly functionality

Fixed:
- Replace is_active with status='active' for Product filtering in IncomingModelForm
- Product model uses status field instead of is_active

Added:
- Showcase field to ProductKit for tracking showcase placement
- product_kit field to Reservation for tracking kit-specific reservations
- Disassemble button in POS terminal for showcase kits
- API endpoint for kit disassembly (release reservations, mark discontinued)
- Improved reservation filtering when dismantling specific kits

Changes:
- ShowcaseManager now links reservations to specific kit instances
- POS terminal modal shows disassemble button in edit mode
- Kit disassembly properly updates stock aggregates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

myproject/products/admin.py

@@ -516,9 +516,6 @@ class ProductKitAdmin(admin.ModelAdmin):
     filter_horizontal = ('categories', 'tags')
     readonly_fields = ('photo_preview_large', 'base_price', 'archived_at', 'archived_by', 'order')
     actions = [
-        restore_items,
-        delete_selected,
-        hard_delete_selected,
         show_poor_quality_photos,
         show_excellent_quality_photos,
         show_all_quality_levels,

myproject/products/migrations/0008_productkit_showcase_and_more.py

@@ -0,0 +1,27 @@
+# Generated by Django 5.0.10 on 2025-11-20 11:24
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('inventory', '0004_showcase_is_default_and_more'),
+        ('orders', '0003_historicalorderitem_is_from_showcase_and_more'),
+        ('products', '0007_add_kit_to_attribute'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='productkit',
+            name='showcase',
+            field=models.ForeignKey(blank=True, help_text='Витрина, на которой выложен временный комплект', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='temporary_kits', to='inventory.showcase', verbose_name='Витрина'),
+        ),
+        migrations.AddIndex(
+            model_name='productkit',
+            index=models.Index(fields=['showcase'], name='products_pr_showcas_08c1ca_idx'),
+        ),
+    ]

myproject/products/models/kits.py

@@ -104,12 +104,23 @@ class ProductKit(BaseProductEntity):
         help_text="Заказ, для которого создан временный комплект"
     )
 
+    showcase = models.ForeignKey(
+        'inventory.Showcase',
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name='temporary_kits',
+        verbose_name="Витрина",
+        help_text="Витрина, на которой выложен временный комплект"
+    )
+
     class Meta:
         verbose_name = "Комплект"
         verbose_name_plural = "Комплекты"
         indexes = [
             models.Index(fields=['is_temporary']),
             models.Index(fields=['order']),
+            models.Index(fields=['showcase']),
         ]
         constraints = [
             # Уникальное имя для активных комплектов (исключаем архивированные и снятые)