refactor: store 目录扁平化重构为 stores（Pinia 推荐结构）

src/utils/auth.ts

@@ -1,6 +1,6 @@
 import { Storage } from "./storage";
 import { STORAGE_KEYS, ROLE_ROOT } from "@/constants";
-import { useUserStoreHook } from "@/store/modules/user";
+import { useUserStoreHook } from "@/stores/user";
 import router from "@/router";
 
 // 负责本地凭证与偏好的读写

src/utils/request.ts

@@ -1,8 +1,8 @@
 import axios, { type InternalAxiosRequestConfig, type AxiosResponse } from "axios";
 import qs from "qs";
 import { ApiCodeEnum } from "@/enums/api";
-import { useUserStoreHook } from "@/store/modules/user";
-import { usePermissionStoreHook } from "@/store/modules/permission";
+import { useUserStoreHook } from "@/stores/user";
+import { usePermissionStoreHook } from "@/stores/permission";
 import { AuthStorage, redirectToLogin } from "@/utils/auth";
 
 // 记录已重试的请求，防止无限循环