refactor(device-identifier): remove unused reset method and clean up imports

src/utils/device_identifier.ts

@@ -10,9 +10,7 @@
  * 注：仅在浏览器环境可用；SSR/Server Components 中调用会抛错。
  */
 import { AuthStorage } from "../data/storage/auth/auth_storage";
-import { StorageKeys } from "../data/storage/storage_keys";
 import { AppEnvUtil } from "./app-env";
-import { SpAsyncUtil } from "./storage";
 
 export class DeviceIdentifier {
   private cachedId: string | null = null;
@@ -33,15 +31,6 @@ export class DeviceIdentifier {
     return this.cachedId;
   }
 
-  /**
-   * 重置缓存与持久化（用于测试或多账号切换）
-   */
-  async reset(): Promise<void> {
-    this.cachedId = null;
-    this.initPromise = null;
-    await SpAsyncUtil.remove(StorageKeys.deviceId);
-  }
-
   private async initialize(): Promise<string> {
     // 1. 优先从 localStorage 读取
     const storedR = await AuthStorage.getInstance().getDeviceId();