fix(youtube): conditionally use cookies if available

DragMusic/platforms/Youtube.py

@@ -30,6 +30,10 @@ class YouTubeAPI:
     def __init__(self):
         self.base = "https://www.youtube.com/watch?v="
         self.opts = {"nocheckcertificate": True, "quiet": True, "no_warnings": True}
+        
+        cookie_file = "cookies.txt"
+        if os.path.exists(cookie_file):
+            self.opts["cookiefile"] = cookie_file
 
     async def get_info(self, link: str):
         """Fetches all video information using yt-dlp."""