refactor(app): tighten feature boundaries

src/app/subscription/components/subscription-checkout-button.tsx

@@ -6,7 +6,7 @@
  */
 import { useEffect, useRef, useState } from "react";
 
-import { PendingPaymentOrderStorage } from "@/data/storage";
+import { savePendingEzpayOrder } from "@/lib/payment/pending_payment_order";
 import {
   usePaymentDispatch,
   usePaymentState,
@@ -280,12 +280,10 @@ async function launchEzpayRedirect({
     return;
   }
 
-  const saveResult = await PendingPaymentOrderStorage.setPendingOrder({
+  const saveResult = await savePendingEzpayOrder({
     orderId,
-    payChannel: "ezpay",
     subscriptionType,
     ...(returnTo ? { returnTo } : {}),
-    createdAt: Date.now(),
   });
   if (Result.isErr(saveResult)) {
     const errorMessage =

src/app/subscription/components/subscription-user-row.tsx

@@ -7,7 +7,7 @@
  *   - 头像右侧两行文本：用户名（16px/600）、副标题（12px/secondary）
  *   - 无头像时显示默认用户图标
  */
-import { UserMessageAvatar } from "@/app/chat/components/user-message-avatar";
+import { UserMessageAvatar } from "@/app/_components";
 
 import styles from "./subscription-user-row.module.css";
 

src/app/subscription/return/page.tsx

@@ -4,23 +4,14 @@ import { useEffect, useState } from "react";
 import { useRouter } from "next/navigation";
 
 import { MobileShell } from "@/app/_components/core";
-import { PendingPaymentOrderStorage } from "@/data/storage";
+import {
+  buildPendingPaymentSubscriptionUrl,
+  getPendingPaymentOrder,
+} from "@/lib/payment/pending_payment_order";
 import { ROUTES } from "@/router/routes";
 
 type ReturnStatus = "loading" | "missing";
 
-function buildSubscriptionUrl(
-  subscriptionType: "vip" | "topup",
-  returnTo?: "chat",
-): string {
-  const params = new URLSearchParams({
-    type: subscriptionType,
-    paymentReturn: "1",
-  });
-  if (returnTo) params.set("returnTo", returnTo);
-  return `${ROUTES.subscription}?${params.toString()}`;
-}
-
 export default function SubscriptionReturnPage() {
   const router = useRouter();
   const [status, setStatus] = useState<ReturnStatus>("loading");
@@ -29,16 +20,11 @@ export default function SubscriptionReturnPage() {
     let cancelled = false;
 
     const redirectToSubscription = async () => {
-      const result = await PendingPaymentOrderStorage.getPendingOrder();
+      const result = await getPendingPaymentOrder();
       if (cancelled) return;
 
       if (result.success && result.data !== null) {
-        router.replace(
-          buildSubscriptionUrl(
-            result.data.subscriptionType,
-            result.data.returnTo,
-          ),
-        );
+        router.replace(buildPendingPaymentSubscriptionUrl(result.data));
         return;
       }
 

src/app/subscription/subscription-screen.tsx

@@ -3,10 +3,13 @@ import { useEffect, useMemo, useRef, useState } from "react";
 import { useRouter } from "next/navigation";
 
 import { BackButton } from "@/app/_components";
-import { consumePendingChatImageReturn } from "@/app/chat/chat-image-return-session";
 import { Checkbox, MobileShell } from "@/app/_components/core";
 import { AppConstants } from "@/core/app_constants";
-import { PendingPaymentOrderStorage } from "@/data/storage";
+import { consumePendingChatImageReturn } from "@/lib/navigation/chat_image_return_session";
+import {
+  clearPendingPaymentOrder,
+  getPendingPaymentOrderForType,
+} from "@/lib/payment/pending_payment_order";
 import {
   usePaymentDispatch,
   usePaymentState,
@@ -85,13 +88,11 @@ export function SubscriptionScreen({
     let cancelled = false;
 
     const handlePendingOrder = async () => {
-      const result = await PendingPaymentOrderStorage.getPendingOrderForType(
-        subscriptionType,
-      );
+      const result = await getPendingPaymentOrderForType(subscriptionType);
       if (cancelled || !result.success || result.data === null) return;
 
       if (!shouldResumePendingOrder) {
-        await PendingPaymentOrderStorage.clearPendingOrder();
+        await clearPendingPaymentOrder();
         if (
           payment.currentOrderId === result.data.orderId &&
           (payment.isPollingOrder || payment.isPaid || payment.status === "failed")
@@ -130,7 +131,7 @@ export function SubscriptionScreen({
     if (!payment.currentOrderId) return;
     if (!payment.isPaid && payment.status !== "failed") return;
 
-    void PendingPaymentOrderStorage.clearPendingOrder();
+    void clearPendingPaymentOrder();
   }, [payment.currentOrderId, payment.isPaid, payment.status]);
 
   const vipOfferPlans = useMemo(