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

src/app/subscription/success/page.tsx

@@ -16,7 +16,7 @@ import Link from "next/link";
 import { useRouter } from "next/navigation";
 
 import { MobileShell } from "@/app/_components/core/mobile-shell";
-import { paymentRepository } from "@/data/repositories/payment_repository";
+import { getPaymentRepository } from "@/data/repositories/payment_repository";
 import { ROUTES } from "@/router/routes";
 
 export default function SubscriptionSuccessPage() {
@@ -33,7 +33,7 @@ export default function SubscriptionSuccessPage() {
     let cancelled = false;
     const tryRefresh = async (attemptsLeft: number) => {
       if (cancelled) return;
-      const r = await paymentRepository.getVipStatus();
+      const r = await getPaymentRepository().getVipStatus();
       if (cancelled) return;
       if (r.success) {
         if (r.data.isVip) {