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

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),
+);