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

lib/api/games.ts

@@ -0,0 +1,9 @@
+import { mockGames } from "@/lib/mock"
+
+export function listGames() {
+  return mockGames
+}
+
+export function getGameById(gameId: string) {
+  return mockGames.find((game) => game.id === gameId)
+}