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/services/product_warehouse.service.go

@@ -58,13 +58,6 @@ func (s productWarehouseService) GetAll(c *fiber.Ctx, params *validation.Query)
 			db = db.Where("warehouse_id = ?", params.WarehouseId)
 		}
 
-		// Search in related product or warehouse names
-		if params.Search != "" {
-			db = db.Joins("LEFT JOIN products ON products.id = product_warehouse.product_id").
-				Joins("LEFT JOIN warehouses ON warehouses.id = product_warehouse.warehouse_id").
-				Where("products.name ILIKE ? OR warehouses.name ILIKE ?", "%"+params.Search+"%", "%"+params.Search+"%")
-		}
-
 		return db.Order("created_at DESC").Order("updated_at DESC")
 	})