Replace entire repo content with shahikitchen-v1-prodcution.zip (v1.1 production)

domain/language/repository.ts

@@ -0,0 +1,7 @@
+import type { Language } from './entities';
+
+/** Port: language preference persistence. */
+export interface LanguageRepository {
+  load(): Language | null;
+  save(language: Language): void;
+}