feat(media): 支持后台转码配置与缩略图轴

fruitshorts-module-playback/src/main/java/com/fruitshorts/playback/service/PlaybackService.java

@@ -8,6 +8,7 @@ import com.fruitshorts.content.service.DramaService;
 import com.fruitshorts.content.service.EpisodeService;
 import com.fruitshorts.media.dal.entity.MediaRendition;
 import com.fruitshorts.media.service.PlaybackSigner;
+import com.fruitshorts.media.service.ThumbnailUrlResolver;
 import com.fruitshorts.media.service.TranscodeService;
 import com.fruitshorts.playback.dal.entity.PlaybackTicket;
 import com.fruitshorts.playback.dal.mapper.PlaybackTicketMapper;
@@ -46,6 +47,7 @@ public class PlaybackService {
     private final PlaybackSigner signer;
     private final EntitlementPort entitlementPort;
     private final TranscodeService transcodeService;
+    private final ThumbnailUrlResolver thumbnailUrlResolver;
 
     @Transactional(rollbackFor = Exception.class)
     public PlayRespVO play(Long userId, Long episodeId, String deviceId, String clientIp) {
@@ -65,6 +67,7 @@ public class PlaybackService {
         vo.setUnlockCoin(episode.getUnlockCoin());
         vo.setPreviewSeconds(episode.getPreviewSeconds());
         vo.setQualities(qualitiesOf(episode.getId()));
+        vo.setThumbnailsUrl(thumbnailUrlResolver.resolve(episode.getId()));
 
         if (!StringUtils.hasText(source)) {
             // 还没转码或没上传片源：明确告诉客户端"没有片源"，而不是给一个播不了的地址

fruitshorts-module-playback/src/main/java/com/fruitshorts/playback/vo/PlayRespVO.java

@@ -23,6 +23,8 @@ public class PlayRespVO {
     private String playUrl;
     /** 可用的清晰度档位 */
     private List<String> qualities;
+    /** 雪碧图 WebVTT 时间轴地址；没有产物时为 null */
+    private String thumbnailsUrl;
     /** 需要多少金币解锁 */
     private Integer unlockCoin;
     /** 试看秒数，0 表示不限制 */