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/forms.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from django import forms
 from django.forms import inlineformset_factory
-from .models import Order, OrderItem, Address
+from .models import Order, OrderItem, Address, OrderStatus
 from customers.models import Customer
 from shops.models import Shop
 from products.models import Product, ProductKit
@@ -281,6 +281,81 @@ OrderItemFormSet = inlineformset_factory(
 )
 
 
+# === СТАТУСЫ ЗАКАЗОВ ===
+
+class OrderStatusForm(forms.ModelForm):
+    """Форма для создания и редактирования статусов заказов"""
+
+    class Meta:
+        model = OrderStatus
+        fields = [
+            'name',
+            'code',
+            'label',
+            'color',
+            'description',
+            'is_positive_end',
+            'is_negative_end',
+        ]
+        widgets = {
+            'name': forms.TextInput(attrs={
+                'class': 'form-control',
+                'placeholder': 'Например: Выполнен, В процессе'
+            }),
+            'code': forms.TextInput(attrs={
+                'class': 'form-control',
+                'placeholder': 'Например: completed, in_progress'
+            }),
+            'label': forms.TextInput(attrs={
+                'class': 'form-control',
+                'placeholder': 'Метка для отображения (опционально)'
+            }),
+            'color': forms.TextInput(attrs={
+                'class': 'form-control',
+                'type': 'color'
+            }),
+            'description': forms.Textarea(attrs={
+                'class': 'form-control',
+                'rows': 3,
+                'placeholder': 'Описание статуса (опционально)'
+            }),
+            'is_positive_end': forms.CheckboxInput(attrs={
+                'class': 'form-check-input'
+            }),
+            'is_negative_end': forms.CheckboxInput(attrs={
+                'class': 'form-check-input'
+            }),
+        }
+
+    def clean(self):
+        cleaned_data = super().clean()
+
+        # Нельзя быть одновременно положительным и отрицательным концом
+        if cleaned_data.get('is_positive_end') and cleaned_data.get('is_negative_end'):
+            raise forms.ValidationError(
+                "Статус не может быть одновременно положительным и отрицательным концом"
+            )
+
+        # Системные статусы нельзя редактировать код
+        if self.instance.pk and self.instance.is_system:
+            original_code = OrderStatus.objects.get(pk=self.instance.pk).code
+            new_code = cleaned_data.get('code')
+            if original_code != new_code:
+                raise forms.ValidationError(
+                    "Нельзя менять код системного статуса"
+                )
+
+        return cleaned_data
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Если редактируем системный статус - делаем код readonly
+        if self.instance.pk and self.instance.is_system:
+            self.fields['code'].widget.attrs['readonly'] = True
+            self.fields['code'].help_text = "Код системного статуса нельзя менять"
+
+
 # === ВРЕМЕННЫЕ КОМПЛЕКТЫ ===
 
 class TemporaryKitForm(forms.ModelForm):