提交 Nontonki 短剧原型，准备推送到远程仓库。

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

test/playback/playback_queue_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/services/playback_queue.dart';
+
+void main() {
+  test(
+    'home feed advances between dramas, series player between episodes',
+    () async {
+      final dramas = await DemoCatalogRepository().fetchDramas();
+      final home = PlaybackQueue.home(dramas);
+      expect(home.length, 3);
+      expect(home.entryAt(0).drama.id, dramas[0].id);
+      expect(home.entryAt(1).drama.id, dramas[1].id);
+      expect(home.entryAt(1).episode.number, 1);
+      expect(home.nextIndex(0), 1);
+      expect(home.nextIndex(2), isNull);
+
+      final series = PlaybackQueue.series(dramas[0]);
+      expect(series.length, 3);
+      expect(series.entryAt(0).drama.id, series.entryAt(1).drama.id);
+      expect(series.entryAt(1).episode.number, 2);
+      expect(series.nextIndex(0), 1);
+      expect(series.nextIndex(2), isNull);
+    },
+  );
+}