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

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(),
+    ),
 );