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/locales/marketing.ts

@@ -0,0 +1,82 @@
+export default {
+  en: {
+    marketing: {
+      seckillTitle: "Flash sale",
+      seckillBreadcrumb: "Flash sale",
+      currentSession: "Now",
+      upcoming: "Coming soon",
+      ended: "Ended",
+      countdown: "Ends in {time}",
+      seckillPrice: "Flash price",
+      originalPrice: "Original price",
+      progress: "Sold {n}%",
+      buyNow: "Grab now",
+      noSeckillProducts: "No flash-sale products right now.",
+      collectiveTitle: "Group deals",
+      collectiveBreadcrumb: "Group deals",
+      collectiveBannerAlt: "Group deal promotion",
+      peopleGroup: "{n} people group",
+      peopleJoined: "{n} people joined",
+      joinGroup: "View deal",
+      noCollectiveProducts: "No group deals right now.",
+      integralTitle: "Points mall",
+      integralBreadcrumb: "Points mall",
+      integralBannerAlt: "Points mall promotion",
+      loginPrompt: "Sign in to see your points",
+      pointsBalance: "My points",
+      customize: "Personal customization",
+      shipping: "Ships within 24 hours",
+      support: "Priority support",
+      recommendation: "Popular rewards",
+      points: "{n} points",
+      marketPrice: "Market price",
+      stock: "Stock {n}",
+      redeem: "Redeem now",
+      redeemed: "Redeemed",
+      mockNotice: "Demo redemption completed",
+      login: "Sign in",
+      register: "Create account",
+      noIntegralProducts: "No rewards available right now.",
+    },
+  },
+  zh: {
+    marketing: {
+      seckillTitle: "限时秒杀",
+      seckillBreadcrumb: "秒杀活动",
+      currentSession: "正在进行",
+      upcoming: "即将开始",
+      ended: "已结束",
+      countdown: "距结束 {time}",
+      seckillPrice: "秒杀价",
+      originalPrice: "原价",
+      progress: "已抢 {n}%",
+      buyNow: "马上抢",
+      noSeckillProducts: "当前暂无秒杀商品。",
+      collectiveTitle: "拼团购",
+      collectiveBreadcrumb: "拼团",
+      collectiveBannerAlt: "拼团活动",
+      peopleGroup: "{n}人团",
+      peopleJoined: "{n}人已拼",
+      joinGroup: "查看详情",
+      noCollectiveProducts: "当前暂无拼团商品。",
+      integralTitle: "积分商城",
+      integralBreadcrumb: "积分商城",
+      integralBannerAlt: "积分商城活动",
+      loginPrompt: "登录后查看您的积分",
+      pointsBalance: "我的积分",
+      customize: "私人定制",
+      shipping: "24小时发货",
+      support: "优先客服",
+      recommendation: "热门推荐",
+      points: "{n}积分",
+      marketPrice: "市场价",
+      stock: "库存 {n}",
+      redeem: "立即兑换",
+      redeemed: "已兑换",
+      mockNotice: "模拟兑换成功",
+      login: "登录",
+      register: "注册",
+      noIntegralProducts: "当前暂无积分商品。",
+    },
+  },
+} as const;