Align balldontlie OpenAPI integration and clarify search metric semantics

apps/api/views.py

@@ -38,6 +38,13 @@ class ReadOnlyBaseAPIView:
 
 
 class PlayerSearchApiView(ReadOnlyBaseAPIView, generics.ListAPIView):
+    """
+    Read-only player search API.
+
+    Metric sorts (`ppg_*`, `mpg_*`) follow the same best-eligible semantics as UI search:
+    max metric value across eligible player-season rows after applying search filters.
+    """
+
     serializer_class = PlayerListSerializer
     pagination_class = ApiPagination