refactor: Remove unused playlist routes and related logic; clean up sound and stream models

app/models/sound.py

@@ -197,21 +197,6 @@ class Sound(db.Model):
         """Find all sounds by type."""
         return cls.query.filter_by(type=sound_type).all()
 
-    @classmethod
-    def get_most_played(cls, limit: int = 10) -> list["Sound"]:
-        """Get the most played sounds."""
-        return cls.query.order_by(cls.play_count.desc()).limit(limit).all()
-
-    @classmethod
-    def get_music_sounds(cls) -> list["Sound"]:
-        """Get all music sounds."""
-        return cls.query.filter_by(is_music=True).all()
-
-    @classmethod
-    def get_deletable_sounds(cls) -> list["Sound"]:
-        """Get all deletable sounds."""
-        return cls.query.filter_by(is_deletable=True).all()
-
     @classmethod
     def create_sound(
         cls,