fix(user): prevent deletion and password modification of admin user in demo mode

internal/logic/admin/user/deleteUserLogic.go

@@ -2,6 +2,8 @@ package user
 
 import (
 	"context"
+	"os"
+	"strings"
 
 	"github.com/perfect-panel/server/internal/svc"
 	"github.com/perfect-panel/server/internal/types"
@@ -25,6 +27,11 @@ func NewDeleteUserLogic(ctx context.Context, svcCtx *svc.ServiceContext) *Delete
 }
 
 func (l *DeleteUserLogic) DeleteUser(req *types.GetDetailRequest) error {
+	isDemo := strings.ToLower(os.Getenv("PPANEL_MODE")) == "demo"
+
+	if req.Id == 2 && isDemo {
+		return errors.Wrapf(xerr.NewErrCodeMsg(503, "Demo mode does not allow deletion of the admin user"), "delete user failed: cannot delete admin user in demo mode")
+	}
 	err := l.svcCtx.UserModel.Delete(l.ctx, req.Id)
 	if err != nil {
 		return errors.Wrapf(xerr.NewErrCode(xerr.DatabaseDeletedError), "delete user error: %v", err.Error())