feat(stream): add Stream model for managing streaming service links to sounds; update Sound model to include relationship with Stream

app/models/sound.py

@@ -12,6 +12,7 @@ from app.database import db
 
 if TYPE_CHECKING:
     from app.models.playlist_sound import PlaylistSound
+    from app.models.stream import Stream
 
 
 class SoundType(Enum):
@@ -96,6 +97,11 @@ class Sound(db.Model):
         back_populates="sound",
         cascade="all, delete-orphan",
     )
+    streams: Mapped[list["Stream"]] = relationship(
+        "Stream",
+        back_populates="sound",
+        cascade="all, delete-orphan",
+    )
 
     def __repr__(self) -> str:
         """String representation of Sound."""