refactor(models): unify table names to singular form for consistency across models

app/models/sound.py

@@ -25,7 +25,7 @@ class SoundType(Enum):
 class Sound(db.Model):
     """Sound model for storing sound file information."""
 
-    __tablename__ = "sounds"
+    __tablename__ = "sound"
 
     id: Mapped[int] = mapped_column(primary_key=True)