feat(media): 新增缺失转码产物自动补齐

fruitshorts-transcode-worker/src/main/resources/application.yml

@@ -42,6 +42,10 @@ fruitshorts:
       # 只有本进程打开转码（§8.5 隔离要求）
       worker-enabled: true
       poll-delay-ms: 3000
+      # 自动巡检缺失码率产物/缩略图的分集并补入队
+      backfill-enabled: true
+      backfill-delay-ms: 300000
+      backfill-batch-size: 20
       ffmpeg-path: ${FFMPEG_PATH:ffmpeg}
       ffprobe-path: ${FFPROBE_PATH:ffprobe}
       segment-seconds: 6