refactor(db): консолидация миграций и рефакторинг кода

Объединены изменения из промежуточных миграций в начальные миграции для упрощения истории базы данных.
Удалены миграции: accounts/0002, discounts/0002, orders/0003-0004, products/0002-0005, user_roles/0002, system_settings/0001-0002, integrations/0001-0002.
Добавлена автоматическая creation пользователя при установке пароля.
Обновлен UI страницы установки пароля с кастомным стилем.
Добавлен conditional rendering для кнопки синхронизации Recommerce.
Исправлены редиректы с 'index' на '/' в accounts views.
Добавлена проверка request.tenant в navbar и authenticate метод в auth backend.

myproject/orders/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 5.0.10 on 2026-01-08 15:58
+# Generated by Django 5.0.10 on 2026-01-14 07:04
 
 import django.db.models.deletion
 import phonenumber_field.modelfields

myproject/orders/migrations/0002_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 5.0.10 on 2026-01-08 15:58
+# Generated by Django 5.0.10 on 2026-01-14 07:04
 
 import django.db.models.deletion
 from django.db import migrations, models

myproject/orders/migrations/0003_order_applied_discount_order_applied_promo_code_and_more.py

@@ -1,40 +0,0 @@
-# Generated by Django 5.0.10 on 2026-01-10 21:12
-
-import django.db.models.deletion
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('discounts', '0001_initial'),
-        ('orders', '0002_initial'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='order',
-            name='applied_discount',
-            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='orders', to='discounts.discount', verbose_name='Примененная скидка'),
-        ),
-        migrations.AddField(
-            model_name='order',
-            name='applied_promo_code',
-            field=models.CharField(blank=True, max_length=50, null=True, verbose_name='Использованный промокод'),
-        ),
-        migrations.AddField(
-            model_name='order',
-            name='discount_amount',
-            field=models.DecimalField(decimal_places=2, default=0, max_digits=10, verbose_name='Сумма скидки'),
-        ),
-        migrations.AddField(
-            model_name='orderitem',
-            name='applied_discount',
-            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='order_items', to='discounts.discount', verbose_name='Скидка на позицию'),
-        ),
-        migrations.AddField(
-            model_name='orderitem',
-            name='discount_amount',
-            field=models.DecimalField(decimal_places=2, default=0, max_digits=10, verbose_name='Сумма скидки'),
-        ),
-    ]

myproject/orders/migrations/0004_remove_old_discount_fields.py

@@ -1,33 +0,0 @@
-# Generated by Django 5.0.10 on 2026-01-11 10:39
-
-from django.db import migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('orders', '0003_order_applied_discount_order_applied_promo_code_and_more'),
-    ]
-
-    operations = [
-        migrations.RemoveField(
-            model_name='order',
-            name='applied_discount',
-        ),
-        migrations.RemoveField(
-            model_name='order',
-            name='applied_promo_code',
-        ),
-        migrations.RemoveField(
-            model_name='order',
-            name='discount_amount',
-        ),
-        migrations.RemoveField(
-            model_name='orderitem',
-            name='applied_discount',
-        ),
-        migrations.RemoveField(
-            model_name='orderitem',
-            name='discount_amount',
-        ),
-    ]