Implement flexible order status management system

Features:
- Created OrderStatus model for managing statuses per tenant
- Added system-level statuses: draft, new, confirmed, in_assembly, in_delivery, completed, return, cancelled
- Implemented CRUD views for managing order statuses
- Created OrderStatusService with status transitions and business logic hooks
- Updated Order model to use ForeignKey to OrderStatus
- Added is_returned flag for tracking returned orders
- Updated filters to work with new OrderStatus model
- Created management command for status initialization
- Added HTML templates for status list, form, and confirmation
- Fixed views.py to use OrderStatus instead of removed STATUS_CHOICES

🤖 Generated with Claude Code

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

myproject/orders/migrations/0002_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 5.0.10 on 2025-11-09 22:18
+# Generated by Django 5.0.10 on 2025-11-13 13:12
 
 import django.db.models.deletion
 from django.conf import settings
@@ -26,6 +26,26 @@ class Migration(migrations.Migration):
             name='product_kit',
             field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='order_items', to='products.productkit', verbose_name='Комплект товаров'),
         ),
+        migrations.AddField(
+            model_name='orderstatus',
+            name='created_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='created_order_statuses', to=settings.AUTH_USER_MODEL, verbose_name='Создано'),
+        ),
+        migrations.AddField(
+            model_name='orderstatus',
+            name='updated_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='updated_order_statuses', to=settings.AUTH_USER_MODEL, verbose_name='Последнее изменение'),
+        ),
+        migrations.AddField(
+            model_name='order',
+            name='status',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='orders', to='orders.orderstatus', verbose_name='Статус заказа'),
+        ),
+        migrations.AddField(
+            model_name='historicalorder',
+            name='status',
+            field=models.ForeignKey(blank=True, db_constraint=False, null=True, on_delete=django.db.models.deletion.DO_NOTHING, related_name='+', to='orders.orderstatus', verbose_name='Статус заказа'),
+        ),
         migrations.AddField(
             model_name='payment',
             name='created_by',
@@ -36,13 +56,37 @@ class Migration(migrations.Migration):
             name='order',
             field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='payments', to='orders.order', verbose_name='Заказ'),
         ),
+        migrations.AddIndex(
+            model_name='orderitem',
+            index=models.Index(fields=['order'], name='orders_orde_order_i_5d347b_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='orderitem',
+            index=models.Index(fields=['product'], name='orders_orde_product_32ff41_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='orderitem',
+            index=models.Index(fields=['product_kit'], name='orders_orde_product_925b51_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='orderstatus',
+            index=models.Index(fields=['code'], name='orders_orde_code_5e1ef7_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='orderstatus',
+            index=models.Index(fields=['is_system'], name='orders_orde_is_syst_2f5b85_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='orderstatus',
+            index=models.Index(fields=['order'], name='orders_orde_order_2e2930_idx'),
+        ),
         migrations.AddIndex(
             model_name='order',
             index=models.Index(fields=['customer'], name='orders_orde_custome_59b6fb_idx'),
         ),
         migrations.AddIndex(
             model_name='order',
-            index=models.Index(fields=['status'], name='orders_orde_status_c6dd84_idx'),
+            index=models.Index(fields=['status'], name='orders_orde_status__eb4f00_idx'),
         ),
         migrations.AddIndex(
             model_name='order',
@@ -65,16 +109,8 @@ class Migration(migrations.Migration):
             index=models.Index(fields=['order_number'], name='orders_orde_order_n_f3ada5_idx'),
         ),
         migrations.AddIndex(
-            model_name='orderitem',
-            index=models.Index(fields=['order'], name='orders_orde_order_i_5d347b_idx'),
-        ),
-        migrations.AddIndex(
-            model_name='orderitem',
-            index=models.Index(fields=['product'], name='orders_orde_product_32ff41_idx'),
-        ),
-        migrations.AddIndex(
-            model_name='orderitem',
-            index=models.Index(fields=['product_kit'], name='orders_orde_product_925b51_idx'),
+            model_name='order',
+            index=models.Index(fields=['is_custom_delivery_cost'], name='orders_orde_is_cust_108e98_idx'),
         ),
         migrations.AddIndex(
             model_name='payment',