feat(BE-47,48,49,50): implement inventory adjustment system

- Extend DB schema with product_warehouses and stock_logs tables
- Implement stock adjustment API (increase/decrease operations)
- Add comprehensive validation for all adjustment operations
- Implement audit log system for each adjustment with history tracking
- Include transaction handling, DTOs, seeders, and proper error handling
- Add adjustment history API with pagination and filtering

TODO: Integration testing pending

internal/modules/inventory/product-warehouses/repositories/product_warehouse.repository.go

@@ -14,6 +14,7 @@ type ProductWarehouseRepository interface {
 	IsProductExist(ctx context.Context, productId uint) (bool, error)
 	IsWarehouseExist(ctx context.Context, warehouseId uint) (bool, error)
 	ExistsByID(ctx context.Context, id uint) (bool, error)
+	GetProductWarehouseByProductAndWarehouseID(ctx context.Context, productId, warehouseId uint) (*entity.ProductWarehouse, error)
 }
 
 type ProductWarehouseRepositoryImpl struct {
@@ -51,3 +52,11 @@ func (r *ProductWarehouseRepositoryImpl) IsWarehouseExist(ctx context.Context, w
 func (r *ProductWarehouseRepositoryImpl) ExistsByID(ctx context.Context, id uint) (bool, error) {
 	return repository.Exists[entity.ProductWarehouse](ctx, r.db, id)
 }
+
+func (r *ProductWarehouseRepositoryImpl) GetProductWarehouseByProductAndWarehouseID(ctx context.Context, productId, warehouseId uint) (*entity.ProductWarehouse, error) {
+	var productWarehouse entity.ProductWarehouse
+	if err := r.DB().WithContext(ctx).Where("product_id = ? AND warehouse_id = ?", productId, warehouseId).First(&productWarehouse).Error; err != nil {
+		return nil, err
+	}
+	return &productWarehouse, nil
+}