Feat[BE]: refactor stock log handling and introduce new log types for adjustments and transfers

internal/entities/stock_log.go

@@ -2,16 +2,6 @@ package entities
 
 import "time"
 
-const (
-	LogTypeAdjustment = "ADJUSTMENT"
-	LogTypeTransfer   = "TRANSFER"
-)
-
-const (
-	TransactionTypeIncrease = "INCREASE"
-	TransactionTypeDecrease = "DECREASE"
-)
-
 type StockLog struct {
 	Id                 uint `gorm:"primaryKey;column:id"`
 	ProductWarehouseId uint `gorm:"column:product_warehouse_id;not null;index"`