feat: Add favorites filtering to sound retrieval; include user-specific favorite sounds in the API response

app/api/v1/sounds.py

@@ -70,6 +70,10 @@ async def get_sounds(  # noqa: PLR0913
         int,
         Query(description="Number of results to skip", ge=0),
     ] = 0,
+    favorites_only: Annotated[
+        bool,
+        Query(description="Show only favorited sounds"),
+    ] = False,
 ) -> SoundsListResponse:
     """Get sounds with optional search, filtering, and sorting."""
     try:
@@ -80,6 +84,8 @@ async def get_sounds(  # noqa: PLR0913
             sort_order=sort_order,
             limit=limit,
             offset=offset,
+            favorites_only=favorites_only,
+            user_id=current_user.id,
         )
         
         # Add favorite indicators for each sound