Tariffs: add outdoor temperature type and OpenMeteo (#27780)

Co-authored-by: Michael Geers <michael@geers.tv>

server/http_config_device_handler.go

@@ -562,7 +562,7 @@ func cleanupTariffRef(name string) {
 		return
 	}
 
-	for _, ref := range []*string{&refs.Grid, &refs.FeedIn, &refs.Co2, &refs.Planner} {
+	for _, ref := range []*string{&refs.Grid, &refs.FeedIn, &refs.Co2, &refs.Planner, &refs.Temperature} {
 		if *ref == name {
 			*ref = ""
 		}

server/http_config_helper.go

@@ -470,6 +470,9 @@ func testInstance(ctx context.Context, instance any) map[string]testResult {
 			case api.TariffTypeSolar:
 				valueKey = "power"
 				ratesKey = "solarRates"
+			case api.TariffTypeTemperature:
+				valueKey = "outdoorTemp"
+				ratesKey = "temperatureRates"
 			default:
 				valueKey = "price"
 			}