feat: real-time download progress, cancel support, admin auto-poll

backend/app/routes/admin.py

@@ -13,6 +13,7 @@ from app.schemas import (
 )
 from app.auth import get_current_user
 from app.services.cleanup import get_setting, set_setting, disk_stats, run_cleanup
+from app.services.downloader import get_progress
 
 router = APIRouter(prefix="/api/admin", tags=["admin"])
 
@@ -48,12 +49,13 @@ async def list_videos(
     total = (await db.execute(count_query)).scalar() or 0
     videos = (await db.execute(query.offset((page - 1) * page_size).limit(page_size))).scalars().all()
 
-    return VideoListResponse(
-        videos=[VideoInfo.model_validate(v) for v in videos],
-        total=total,
-        page=page,
-        page_size=page_size,
-    )
+    items = []
+    for v in videos:
+        info = VideoInfo.model_validate(v)
+        if v.status == "downloading":
+            info.progress = get_progress(v.task_id)
+        items.append(info)
+    return VideoListResponse(videos=items, total=total, page=page, page_size=page_size)
 
 
 @router.delete("/videos/{video_id}")