fix: workflow namespace should be 'temporal' not 'api'

The workflow service is deployed in the temporal namespace:
temporal-frontend.temporal.svc.cluster.local:7233

Update ServiceAdapter to use correct namespace for workflow routing.

cmd/gateway/main.go

@@ -76,7 +76,7 @@ func main() {
 	// Add workflow service adapter (uses Temporal handler for gRPC forwarding)
 	workflowSpec := serviceadapter.GetWorkflowSpec()
 	workflowAdapter := &serviceadapter.ServiceAdapter{
-		Namespace:   "api",
+		Namespace:   "temporal",
 		ServiceName: "workflow",
 		Spec:        *workflowSpec,
 	}