feat: add Download Logs tab in admin panel

backend/app/routes/admin.py

@@ -78,16 +78,25 @@ async def download_logs(
     user: dict = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ):
-    query = select(DownloadLog).order_by(DownloadLog.downloaded_at.desc())
+    from sqlalchemy.orm import joinedload
+    query = (
+        select(DownloadLog)
+        .options(joinedload(DownloadLog.video))
+        .order_by(DownloadLog.downloaded_at.desc())
+    )
     count_query = select(func.count(DownloadLog.id))
     if video_id is not None:
         query = query.where(DownloadLog.video_id == video_id)
         count_query = count_query.where(DownloadLog.video_id == video_id)
     total = (await db.execute(count_query)).scalar() or 0
     logs = (await db.execute(query.offset((page - 1) * page_size).limit(page_size))).scalars().all()
-    return DownloadLogListResponse(
-        logs=[DownloadLogInfo.model_validate(l) for l in logs],
-        total=total,
-        page=page,
-        page_size=page_size,
-    )
+
+    items = []
+    for l in logs:
+        d = DownloadLogInfo.model_validate(l)
+        if l.video:
+            d.video_title = l.video.title or ""
+            d.video_platform = l.video.platform or ""
+        items.append(d)
+
+    return DownloadLogListResponse(logs=items, total=total, page=page, page_size=page_size)