feat: auto-generate unique SKU when blank during product creation to match Python FastAPI schema validation behavior

controllers/product_controller.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
+	"math/rand"
 )
 
 // DTOs untuk Kategori & Produk
@@ -374,8 +375,9 @@ func CreateProduct(c *gin.Context) {
 		return
 	}
 
-	if req.SKU != nil && *req.SKU == "" {
-		req.SKU = nil
+	if req.SKU == nil || *req.SKU == "" {
+		generated := fmt.Sprintf("SKU-%04X%04X", rand.Intn(65536), rand.Intn(65536))
+		req.SKU = &generated
 	}
 
 	// Verifikasi SKU jika diisi