Fix shorts: duongdenworldcup as fallback when baodantri/baosuckhoedoisong fail

main.py

@@ -176,15 +176,16 @@ def _yt_channel_shorts(channel, count=15):
         return videos
     except:return[]
 def scrape_shorts():
-    """Fetch shorts from @baodantri7941 + @baosuckhoedoisongboyte"""
+    """Fetch shorts from @baodantri7941 + @baosuckhoedoisongboyte (fallback: @duongdenworldcup_2026)"""
     vids=[]
-    try:vids=_yt_channel_shorts("baodantri7941",15)
-    except:pass
-    if len(vids)<5:
+    for ch in ["baodantri7941","baosuckhoedoisongboyte"]:
         try:
-            r=_yt_channel_shorts("baosuckhoedoisongboyte",10)
+            r=_yt_channel_shorts(ch,12)
             if r:vids.extend(r)
         except:pass
+    if not vids:
+        try:vids=_yt_channel_shorts("duongdenworldcup_2026",20)
+        except:pass
     vids.sort(key=lambda x:x.get("id",""),reverse=True)
     return vids[:20]
 def scrape_worldcup_shorts():