feat(mall): address book wave 7 frontend, contract, and archive

Live addresses domain for the mall: shared contract (AddressBookEntry +
five client methods), mock adapter state v3, live domain pick, addresses
page CRUD, checkout saved-address picker with manual fallback, demo seed,
and the archived change plus address-book capability spec.

apps/mall/locales/user.ts

@@ -68,6 +68,8 @@ export default {
       defaultAddress: "Default",
       setDefault: "Set as default",
       saveAddress: "Save address",
+      country: "Country",
+      saveFailed: "Save failed. Please try again.",
       noAddresses: "No shipping addresses yet.",
       favoritesTitle: "Favorites",
       favoriteProductsTab: "Products",
@@ -159,6 +161,8 @@ export default {
       defaultAddress: "默认",
       setDefault: "设为默认",
       saveAddress: "保存地址",
+      country: "国家",
+      saveFailed: "保存失败，请重试。",
       noAddresses: "暂无收货地址。",
       favoritesTitle: "我的收藏",
       favoriteProductsTab: "商品",