refactor: 删除 constants 目录，直接使用源路径

- 删除 src/constants/ 目录（仅为转发代理）
- 更新 8 个文件的导入路径：
  * STORAGE_KEYS  @/config/storage
  * VALIDATORS  @/utils/validators
  * ROLE_ROOT  @/enums
- 修复旧的枚举路径（settings/device-enum 等）

src/views/system/user/index.vue

@@ -257,7 +257,7 @@ import type { UserForm, UserPageQuery, UserPageVO } from "@/api/system/user";
 
 // ==================== 3.5 工具函数 ====================
 import { downloadFile } from "@/utils";
-import { VALIDATORS } from "@/constants";
+import { VALIDATORS } from "@/utils/validators";
 // ==================== 4. API 服务 ====================
 import UserAPI from "@/api/system/user";
 import DeptAPI from "@/api/system/dept";