feat(mall): classic B2B2C PC storefront with fixed mock API layer

- Mock adapter implementing @vmall/shared ApiClient (localStorage-persisted
  cart/orders/invoices), runtime switch via mockApi flag (default on)
- Fixed bilingual mock catalog: 3-level categories, 24 products w/ SKUs,
  stores, brands, banners, floors, seckill/collective/integral, comments,
  coupons, addresses, seeded orders/shipments/invoices
- B2B2C mall shell: top bar, logo/search/cart header, dark nav + category
  mega-menu, value-prop footer, back-to-top; 1200px grid, #ca151e theme
- UI primitives replacing element-plus: carousel, pagination, breadcrumb,
  qty stepper, rating stars, modal, tabs, step bar, product card
- Pages: home floors, search (filters/sort/paging), goods detail (SKU
  picker, store rail, review tabs), cart -> checkout -> pay -> success,
  auth pages, user center (dashboard/orders/addresses/favorites/coupons/
  invoices), stores, seckill, collective, integral
- i18n split into per-domain locale modules (en+zh)
- OpenSpec change mall-pc-storefront-replica archived; all specs green

apps/mall/pages/checkout/success.vue

@@ -0,0 +1,68 @@
+<script setup lang="ts">
+definePageMeta({ middleware: "auth" });
+
+const { t } = useI18n();
+
+const stepLabels = computed(() => [
+  t("checkout.steps.cart"),
+  t("checkout.steps.order"),
+  t("checkout.steps.payment"),
+  t("checkout.steps.complete"),
+]);
+</script>
+
+<template>
+  <div class="transaction-page success-page">
+    <div class="w1200">
+      <UiStepBar :steps="stepLabels" :active="3" />
+      <section class="mpanel success-panel">
+        <div class="success-icon" aria-hidden="true">✓</div>
+        <h1>{{ t("checkout.successTitle") }}</h1>
+        <p>{{ t("checkout.successMessage") }}</p>
+        <div class="success-actions">
+          <NuxtLink class="mbtn red" to="/user/orders">{{ t("checkout.viewOrders") }}</NuxtLink>
+          <NuxtLink class="mbtn gray" to="/">{{ t("checkout.continueShopping") }}</NuxtLink>
+        </div>
+      </section>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.transaction-page {
+  padding: 24px 0 80px;
+  background: #f5f5f5;
+  min-height: 60vh;
+}
+.success-panel {
+  padding: 60px 20px 70px;
+  text-align: center;
+}
+.success-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 72px;
+  height: 72px;
+  border-radius: 50%;
+  background: var(--mall-green);
+  color: #fff;
+  font-size: 48px;
+  line-height: 1;
+}
+.success-panel h1 {
+  margin: 22px 0 10px;
+  font-size: 24px;
+  font-weight: 500;
+}
+.success-panel p {
+  margin: 0;
+  color: var(--mall-muted);
+}
+.success-actions {
+  display: flex;
+  justify-content: center;
+  gap: 12px;
+  margin-top: 28px;
+}
+</style>