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/dto/product_warehouse.dto.go

@@ -13,7 +13,7 @@ type ProductWarehouseBaseDTO struct {
 	Id          uint `json:"id"`
 	ProductId   uint `json:"product_id"`
 	WarehouseId uint `json:"warehouse_id"`
-	Quantity    int  `json:"quantity"`
+	Quantity    float64  `json:"quantity"`
 }
 
 type ProductWarehouseListDTO struct {