feat: implement lazy singleton pattern for repository instances and update related imports

src/stores/user/user-machine.actors.ts

@@ -8,18 +8,14 @@
  *
  * 设计：
  *   - 依赖 `user-machine.helpers.ts`（toView, readInitData, userStorage）
- *   - 仓库以接口类型注入（调用面只看接口，运行时仍是同一单例）
+ *   - 仓库使用懒单例 getter，actor 执行时才创建实例
  *   - 命名约定：`[user-machine]` 前缀日志（如未来加）—— 与 chat 模块对齐
  */
 
 import { fromPromise } from "xstate";
 
-import { userRepository } from "@/data/repositories/user_repository";
-import { authRepository } from "@/data/repositories/auth_repository";
-import type {
-  IAuthRepository,
-  IUserRepository,
-} from "@/data/repositories/interfaces";
+import { getUserRepository } from "@/data/repositories/user_repository";
+import { getAuthRepository } from "@/data/repositories/auth_repository";
 import { Result } from "@/utils";
 
 import {
@@ -32,13 +28,6 @@ import {
   userStorage,
 } from "./user-machine.helpers";
 
-// ============================================================
-// 仓库注入
-// ============================================================
-// 仓库以接口类型注入：调用面只看接口，运行时仍是同一单例
-const userRepo: IUserRepository = userRepository;
-const authRepo: IAuthRepository = authRepository;
-
 // ============================================================
 // Init actor：从 UserStorage 读 user + avatarUrl
 // ============================================================
@@ -59,6 +48,7 @@ export const userInitActor = fromPromise<InitData>(async () => readInitData());
  * - 任一失败都不阻断另一方，machine 层负责保留已有 context
  */
 export const userFetchActor = fromPromise<UserFetchData>(async () => {
+  const userRepo = getUserRepository();
   const [userResult, entitlementsResult] = await Promise.all([
     userRepo.getCurrentUser(),
     userRepo.getEntitlements(),
@@ -97,5 +87,5 @@ export const userFetchActor = fromPromise<UserFetchData>(async () => {
  * - onDone / onError 都跑 `clearUser` action（machine 层）—— 失败也清本地
  */
 export const userLogoutActor = fromPromise<void>(async () => {
-  await authRepo.logout();
+  await getAuthRepository().logout();
 });