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

docs/apifox-app-apis.swagger.json

@@ -169,6 +169,7 @@
         "onlineVersion": { "type": "integer", "example": 1 },
         "totalEpisodes": { "type": "integer", "example": 20 },
         "publishedEpisodes": { "type": "integer", "example": 10 },
+        "plays": { "type": "integer", "example": 12345 },
         "createdAt": { "type": "string", "format": "date-time" },
         "updatedAt": { "type": "string", "format": "date-time" }
       }