[Enhance] API & LinkPlay & something else

- Add song names for getting the score list (For API)
- Try to ensure thread safety in Link Play (twice again)
- Small change about database timeout
- Have a try to use `nginx` and `gevent` (Yes. I ensure it works well. This will not be viewed as a formal and necessary update.)

latest version/core/song.py

@@ -8,6 +8,7 @@ class Chart:
         self.c = c
         self.set_chart(song_id, difficulty)
         self.defnum: int = None
+        self.song_name: str = None
 
     def to_dict(self) -> dict:
         return {