Add utility scripts for stock reservation management

- Add check_stock.py: script to view Stock records with reservations
- Add refresh_stock_reservations.py: standalone script to recalculate quantity_reserved for all Stock records
- Both scripts work with 'grach' tenant schema

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

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

myproject/check_stock.py

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+"""
+Проверка Stock с quantity_reserved
+"""
+import os
+import django
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
+django.setup()
+
+from django.db import connection
+
+with connection.cursor() as cursor:
+    cursor.execute("SET search_path TO grach")
+
+    # Проверяем Stock с резервами
+    print("Stock с резервами:\n")
+    cursor.execute("""
+        SELECT
+            s.id,
+            p.name as product_name,
+            s.quantity_available,
+            s.quantity_reserved,
+            (s.quantity_available - s.quantity_reserved) as free_quantity
+        FROM grach.inventory_stock s
+        JOIN grach.products_product p ON p.id = s.product_id
+        ORDER BY s.quantity_reserved DESC
+    """)
+
+    print(f"{'ID':<5} {'Товар':<30} {'Всего':<10} {'Резерв':<10} {'Свободно':<10}")
+    print("=" * 75)
+
+    for row in cursor.fetchall():
+        stock_id, product_name, qty_available, qty_reserved, free_qty = row
+        print(f"{stock_id:<5} {product_name:<30} {qty_available:<10} {qty_reserved:<10} {free_qty:<10}")

myproject/refresh_stock_reservations.py

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+"""
+Скрипт для пересчета quantity_reserved для всех Stock записей
+Нужен после добавления сигналов для Reservation
+"""
+import os
+import django
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
+django.setup()
+
+from django.db import connection
+from inventory.models import Stock
+
+# Устанавливаем схему для работы с tenant
+with connection.cursor() as cursor:
+    cursor.execute('SET search_path TO grach')
+
+print('[НАЧАЛО] Обновление quantity_reserved для всех Stock записей...')
+
+# Получаем все Stock записи
+stocks = Stock.objects.all()
+total_count = stocks.count()
+
+print(f'[INFO] Найдено Stock записей: {total_count}')
+
+updated_count = 0
+for stock in stocks:
+    try:
+        # Вызываем refresh_from_batches() который пересчитывает quantity_reserved
+        stock.refresh_from_batches()
+        updated_count += 1
+
+        if stock.quantity_reserved > 0:
+            print(f'  [OK] Stock #{stock.id}: {stock.product.name} - зарезервировано: {stock.quantity_reserved}')
+    except Exception as e:
+        print(f'  [ОШИБКА] Stock #{stock.id}: {str(e)}')
+
+print(f'\n[ЗАВЕРШЕНО] Обновлено записей: {updated_count} из {total_count}')
+print('[OK] Все резервы пересчитаны!')