feat(search): add SoundCloud source and cross-platform relevance ranking

app/providers/universal.py

@@ -17,7 +17,10 @@ class UniversalProvider(BaseProvider):
             "music.apple.com",
             "youtube.com",
             "youtu.be",
-            "music.youtube.com"
+            "music.youtube.com",
+            "soundcloud.com",
+            "snd.sc",
+            "api.soundcloud.com"
         ])
 
     async def resolve(self, url: str) -> List[TrackMetadata]:
@@ -106,15 +109,16 @@ class UniversalProvider(BaseProvider):
                         continue
                     title = entry.get("title", "Unknown")
                     uploader = entry.get("uploader") or entry.get("artist") or "Unknown"
+                    service_name = "soundcloud" if ("soundcloud" in (entry.get("webpage_url") or url).lower() or "snd.sc" in url.lower()) else "youtube"
                     tracks.append(TrackMetadata(
-                        service="youtube",
+                        service=service_name,
                         service_id=str(entry.get("id", "")),
                         title=title,
                         artist=uploader,
                         album=entry.get("album"),
                         duration_ms=int(entry.get("duration", 0) * 1000) if entry.get("duration") else None,
                         cover_url=entry.get("thumbnail"),
-                        source_url=entry.get("webpage_url") or f"https://www.youtube.com/watch?v={entry.get('id')}"
+                        source_url=entry.get("webpage_url") or url
                     ))
         except Exception as e:
             print(f"yt-dlp resolve error: {e}")
@@ -144,7 +148,7 @@ class UniversalProvider(BaseProvider):
         }
 
         try:
-            target_input = track.source_url if track.service == "youtube" and track.source_url else f"ytsearch1:{query}"
+            target_input = track.source_url if track.service in ("youtube", "soundcloud") and track.source_url else f"ytsearch1:{query}"
             with yt_dlp.YoutubeDL(ydl_opts) as ydl:
                 ydl.download([target_input])