feat(dramas): add play count field for drama records

1. 新增plays字段到DramaRecord接口和swagger/openapi文档
2. 在剧集创建时默认设置plays为0
3. 新增getPlayCountsByDramaIds方法聚合剧集播放量
4. 在后台和前台剧集列表中添加播放量数据
5. 更新测试用例适配新增的plays字段

test/dramas.e2e-spec.ts

@@ -264,7 +264,10 @@ describe('Dramas and episodes', () => {
 
     expect(dramas.body.data.list).toEqual(
       expect.arrayContaining([
-        expect.objectContaining({ title: 'Published Drama' }),
+        expect.objectContaining({
+          title: 'Published Drama',
+          plays: 0,
+        }),
       ]),
     );
     const publishedDrama = dramas.body.data.list.find(
@@ -365,6 +368,7 @@ describe('Dramas and episodes', () => {
         expect.objectContaining({
           title: 'Recommended Search Drama',
           isRecommended: true,
+          plays: 0,
         }),
       ]),
     );