refactor(data): add mock API adapters, id utility, and toast feedback

lib/api/shops.ts

@@ -0,0 +1,13 @@
+import { useShopStore } from "@/store/shops"
+
+export function listShops() {
+  return useShopStore.getState().shops
+}
+
+export function getShopById(shopId: string) {
+  return useShopStore.getState().shops.find((shop) => shop.id === shopId)
+}
+
+export function getShopByOwnerId(ownerId: string) {
+  return useShopStore.getState().shops.find((shop) => shop.owner.id === ownerId)
+}