feat: stack model processor

backend/stacks/handler.go

@@ -209,14 +209,14 @@ func (h *StackHandler) createStack(body CreateStackBody, w http.ResponseWriter,
 	}
 
 	// TODO: Add the stack processor here
-	_, err = h.stackModel.Save(ctx, userID, body.Title, body.Description, model.Progress_NotStarted)
+	stack, err := h.stackModel.Save(ctx, userID, body.Title, body.Description, model.Progress_NotStarted)
 	if err != nil {
 		h.logger.Warn("could not save stack", "err", err)
 		w.WriteHeader(http.StatusInternalServerError)
 		return
 	}
 
-	w.WriteHeader(http.StatusOK)
+	middleware.WriteJsonOrError(h.logger, stack, w)
 }
 
 func (h *StackHandler) CreateRoutes(r chi.Router) {