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/demo_media_test.dart

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+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:nontonki/core/data/repositories/catalog_repository.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  test('all mock entries reuse one bundled local demo video', () async {
+    final dramas = await DemoCatalogRepository().fetchDramas();
+    expect(dramas, hasLength(3));
+    expect(dramas.every((drama) => drama.episodes.length == 3), isTrue);
+    final paths = {
+      for (final drama in dramas)
+        for (final episode in drama.episodes) episode.assetPath,
+    };
+    expect(paths, {'assets/media/demo_clip.mp4'});
+    expect(
+      dramas.every(
+        (drama) => drama.episodes.every((episode) => episode.isFree),
+      ),
+      isTrue,
+    );
+    final bytes = await rootBundle.load(paths.single);
+    expect(bytes.lengthInBytes, greaterThan(1000000));
+  });
+}