fix(media): 修正转码任务认领与媒资 id 校验

sql/patch-2026-10-22-transcode-task-id-fix.sql

@@ -0,0 +1,22 @@
+-- Author: fruit.com.cn
+-- 收口未绑定分集或媒资不存在的僵尸转码任务（可重复执行）
+
+BEGIN;
+
+UPDATE transcode_task t
+SET status = 'FAILED',
+    error_msg = '历史任务无效：episode_id=0 或 media_asset_id 指向不存在的媒资，请从有视频的分集重新转码',
+    finished_at = CURRENT_TIMESTAMP
+WHERE t.deleted = 0
+  AND t.status IN ('QUEUED', 'RUNNING')
+  AND (
+    t.episode_id = 0
+    OR NOT EXISTS (
+      SELECT 1
+      FROM media_asset a
+      WHERE a.id = t.media_asset_id
+        AND a.deleted = 0
+    )
+  );
+
+COMMIT;