提交 Nontonki 短剧原型，准备推送到远程仓库。

Co-authored-by: Cursor <cursoragent@cursor.com>

test/catalog/catalog_controller_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:nontonki/core/data/repositories/catalog_repository.dart';
+import 'package:nontonki/core/data/models/drama.dart';
+import 'package:nontonki/core/data/services/catalog_controller.dart';
+
+void main() {
+  test(
+    'empty catalog is distinct from a failed load, and retry recovers',
+    () async {
+      final repo = ScriptedCatalogRepository();
+      final controller = CatalogController(repo);
+      await controller.load();
+      expect(controller.dramas, isEmpty);
+      expect(controller.error, isNull);
+
+      repo.fail = true;
+      await controller.load();
+      expect(controller.error, isNotNull);
+
+      repo.fail = false;
+      repo.items = await DemoCatalogRepository().fetchDramas();
+      await controller.load();
+      expect(controller.error, isNull);
+      expect(controller.dramas, hasLength(3));
+      expect(controller.dramas.first.episodes.length, 3);
+    },
+  );
+}
+
+class ScriptedCatalogRepository implements CatalogRepository {
+  bool fail = false;
+  List<Drama> items = const [];
+
+  @override
+  Future<List<Drama>> fetchDramas() async {
+    if (fail) throw StateError('offline');
+    return items;
+  }
+}