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

src/data/repositories/auth_repository.ts

@@ -1,17 +1,5 @@
 "use client";
 
-/**
- * AuthRepository
- *
- * 认证仓库：编排远程 API + 本地 AuthStorage + UserStorage。
- * 行为对齐原 Dart `lib/data/repositories/auth_repository_impl.dart`：
- *   - 登录成功后调 `_saveLoginData` 持久化 token + User
- *   - 登出先调 API，再强制清本地态（无论 API 成败）
- *   - `getCurrentUser` 成功后尽力写本地 User 缓存（不因缓存失败影响主流程）
- *   - 写 storage 失败用 `Logger.warn` 记录，不让本地缓存失败影响主流程
- *
- * 
- */
 import { AuthApi, authApi } from "@/data/services/api";
 import {
   AppleLoginRequest,
@@ -32,6 +20,7 @@ import { AppEnvUtil, Result, Logger } from "@/utils";
 import type { IAuthRepository } from "@/data/repositories/interfaces";
 import { AuthStorage, type IAuthStorage } from "@/data/storage/auth";
 import { UserStorage, type IUserStorage } from "@/data/storage/user";
+import { createLazySingleton } from "./lazy_singleton";
 
 const log = new Logger("DataRepositoriesAuthRepository");
 
@@ -312,11 +301,14 @@ export class AuthRepository implements IAuthRepository {
   }
 }
 
-/** 全局单例。 */
-export const authRepository = new AuthRepository(
-  authApi,
-  AuthStorage.getInstance(),
-  UserStorage.getInstance(),
+/** 全局懒单例。 */
+export const getAuthRepository = createLazySingleton<IAuthRepository>(
+  () =>
+    new AuthRepository(
+      authApi,
+      AuthStorage.getInstance(),
+      UserStorage.getInstance(),
+    ),
 );
 
 function withTestAccountFlag<T extends Record<string, unknown>>(

src/data/repositories/chat_repository.ts

@@ -13,6 +13,7 @@ import {
 import { Result } from "@/utils";
 import type { IChatRepository } from "@/data/repositories/interfaces";
 import { LocalChatStorage, LocalMessage } from "@/data/storage/chat";
+import { createLazySingleton } from "./lazy_singleton";
 
 export class ChatRepository implements IChatRepository {
   constructor(
@@ -186,8 +187,11 @@ export class ChatRepository implements IChatRepository {
   }
 }
 
-/** 全局单例。 */
-export const chatRepository = new ChatRepository(
-  chatApi,
-  LocalChatStorage.getInstance(),
+/** 全局懒单例。 */
+export const getChatRepository = createLazySingleton<IChatRepository>(
+  () =>
+    new ChatRepository(
+      chatApi,
+      LocalChatStorage.getInstance(),
+    ),
 );

src/data/repositories/lazy_singleton.ts

@@ -0,0 +1,7 @@
+export function createLazySingleton<T>(factory: () => T): () => T {
+  let instance: T | null = null;
+  return () => {
+    instance ??= factory();
+    return instance;
+  };
+}

src/data/repositories/metrics_repository.ts

@@ -9,6 +9,7 @@ import { MetricsApi, metricsApi } from "@/data/services/api";
 import { AppEvent, PwaEvent } from "@/data/dto/metrics";
 import { Result } from "@/utils";
 import type { IMetricsRepository } from "@/data/repositories/interfaces";
+import { createLazySingleton } from "./lazy_singleton";
 
 export class MetricsRepository implements IMetricsRepository {
   constructor(private readonly api: MetricsApi) {}
@@ -56,5 +57,7 @@ export class MetricsRepository implements IMetricsRepository {
   }
 }
 
-/** 全局单例。 */
-export const metricsRepository = new MetricsRepository(metricsApi);
+/** 全局懒单例。 */
+export const getMetricsRepository = createLazySingleton<IMetricsRepository>(
+  () => new MetricsRepository(metricsApi),
+);

src/data/repositories/payment_repository.ts

@@ -18,6 +18,7 @@ import { PaymentApi, paymentApi } from "@/data/services/api";
 import { PaymentPlansStorage } from "@/data/storage/payment";
 import type { IPaymentRepository } from "@/data/repositories/interfaces";
 import { Result } from "@/utils/result";
+import { createLazySingleton } from "./lazy_singleton";
 
 export class PaymentRepository implements IPaymentRepository {
   constructor(private readonly api: PaymentApi) {}
@@ -83,8 +84,10 @@ export class PaymentRepository implements IPaymentRepository {
   }
 }
 
-/** 全局单例。 */
-export const paymentRepository = new PaymentRepository(paymentApi);
+/** 全局懒单例。 */
+export const getPaymentRepository = createLazySingleton<IPaymentRepository>(
+  () => new PaymentRepository(paymentApi),
+);
 
 export function isVipPaymentPlan(plan: PaymentPlan): boolean {
   return plan.vipDays !== null;

src/data/repositories/user_repository.ts

@@ -10,6 +10,7 @@ import {
 } from "@/data/dto/user";
 import { Result } from "@/utils";
 import type { IUserRepository } from "@/data/repositories/interfaces";
+import { createLazySingleton } from "./lazy_singleton";
 
 export class UserRepository implements IUserRepository {
   constructor(private readonly api: UserApi) {}
@@ -48,5 +49,7 @@ export class UserRepository implements IUserRepository {
   }
 }
 
-/** 全局单例。 */
-export const userRepository = new UserRepository(userApi);
+/** 全局懒单例。 */
+export const getUserRepository = createLazySingleton<IUserRepository>(
+  () => new UserRepository(userApi),
+);