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/search.ts

@@ -0,0 +1,40 @@
+export default {
+  en: {
+    search: {
+      home: "Home",
+      searchResults: 'Results for "{keyword}"',
+      productList: "Product list",
+      category: "Category",
+      all: "All",
+      brand: "Brand",
+      sort: "Sort",
+      defaultSort: "Default",
+      price: "Price",
+      sales: "Sales",
+      comments: "Reviews",
+      ascending: "Ascending",
+      descending: "Descending",
+      empty: "No products found",
+      resultCount: "{n} products",
+    },
+  },
+  zh: {
+    search: {
+      home: "首页",
+      searchResults: '搜索 “{keyword}” 结果列表',
+      productList: "商品列表",
+      category: "商品分类",
+      all: "全部",
+      brand: "品牌筛选",
+      sort: "筛选排序",
+      defaultSort: "默认",
+      price: "价格",
+      sales: "销量",
+      comments: "评论",
+      ascending: "升序",
+      descending: "降序",
+      empty: "暂无相关商品",
+      resultCount: "共 {n} 件商品",
+    },
+  },
+};