Removed deprecated text fields and WindowMinutes from the observations endpoint

internal/adapters/httpapi/server_test.go

@@ -142,12 +142,21 @@ func TestObservationsCurrentReturnsUSUnits(t *testing.T) {
 	if _, exists := summary["temperatureC"]; exists {
 		t.Fatalf("did not expect metric key temperatureC in US response")
 	}
+	if _, exists := summary["windowMinutes"]; exists {
+		t.Fatalf("did not expect deprecated key windowMinutes in observations summary")
+	}
 
 	conditions := payload["conditions"].([]any)
 	first := conditions[0].(map[string]any)
 	if got := first["temperatureF"].(float64); got != 50.0 {
 		t.Fatalf("expected conditions[0].temperatureF=50.0, got %v", got)
 	}
+	if _, exists := first["providerRawDescription"]; exists {
+		t.Fatalf("did not expect deprecated key providerRawDescription in observations condition")
+	}
+	if _, exists := first["conditionText"]; exists {
+		t.Fatalf("did not expect deprecated key conditionText in observations condition")
+	}
 
 	if obsRepo.summaryWin != constants.ObservationWindow || obsRepo.conditionsWin != constants.ObservationWindow || obsRepo.precipWin != constants.ObservationWindow {
 		t.Fatalf("expected observation window %s to be used", constants.ObservationWindow)
@@ -273,6 +282,9 @@ func TestNullFieldsAreOmittedFromJSON(t *testing.T) {
 	if _, exists := summary["temperatureF"]; exists {
 		t.Fatalf("expected summary.temperatureF to be omitted when nil")
 	}
+	if _, exists := summary["windowMinutes"]; exists {
+		t.Fatalf("expected summary.windowMinutes to be omitted")
+	}
 
 	conditions := obsPayload["conditions"].([]any)
 	firstCond := conditions[0].(map[string]any)