Added support for rounding of values by default in API responses

internal/adapters/inbound/httpapi/observations_endpoint.go

@@ -14,13 +14,13 @@ import (
 func observationDefinition(svc Service) endpoint.Definition {
 	return endpoint.GET(
 		"/observations",
-		bindQuery,
-		func(ctx context.Context, req queryRequest) (any, error) {
+		bindPrecisionQuery,
+		func(ctx context.Context, req precisionQueryRequest) (any, error) {
 			obs, err := svc.LatestObservation(ctx)
 			if err != nil {
 				return nil, err
 			}
-			return response.Envelope{Data: presenter.ObservationPayload(obs, req.Units)}, nil
+			return response.Envelope{Data: presenter.ObservationPayload(obs, req.Units, req.Precision)}, nil
 		},
 		endpoint.WithProduces(render.FormatJSON, render.FormatXML, render.FormatText),
 		endpoint.WithTemplate("observations.txt.tmpl"),