fix(captain): 护栏/回复指南编辑按钮不生效

根因：
1. guardrails/guidelines 页面直接导航时 store 无助手记录，getRecord
   返回空对象导致列表为空、编辑无数据
2. storeFactoryHelper updateRecord 用 EDIT mutation（仅更新已有记录），
   store 为空时 API 返回数据被丢弃

修复：
- storeFactoryHelper: updateRecord 改用 UPSERT，确保 API 返回记录始终写入 store
- guardrails/Index.vue & guidelines/Index.vue: onMounted 时若 store 无记录
  则 dispatch captainAssistants/show 拉取单条助手数据

frontend/app/javascript/dashboard/store/storeFactoryHelper.js

@@ -56,7 +56,10 @@ export const updateRecord =
     commit(mutationTypes.SET_UI_FLAG, { updatingItem: true });
     try {
       const response = await API.update(id, updateObj);
-      commit(mutationTypes.EDIT, response.data);
+      // Use UPSERT instead of EDIT so that the record is added to the store
+      // even if it wasn't previously loaded (e.g. direct URL navigation to
+      // a sub-page like guardrails/guidelines without visiting the list page).
+      commit(mutationTypes.UPSERT, response.data);
       return response.data;
     } catch (error) {
       return throwErrorMessage(error);