Add callback and update user role

internal/handlers/http/user/user.go

@@ -1,6 +1,7 @@
 package user
 
 import (
+	"furtuna-be/internal/constants/role"
 	"net/http"
 	"strconv"
 	"time"
@@ -64,6 +65,11 @@ func (h *Handler) Create(c *gin.Context) {
 		}
 	}
 
+	if req.RoleID == role.Casheer && req.SiteID == nil {
+		response.ErrorWrapper(c, errors.NewServiceException("site id is required for cashier"))
+		return
+	}
+
 	res, err := h.service.Create(ctx, req.ToEntity())
 	if err != nil {
 		response.ErrorWrapper(c, err)