Fix: readiness probe for execute-service uses /health/ready

Change readiness probe from /health (always ok) to /health/ready
(checks executor initialization state). Applied to both:
- apps/base K8s deployment
- Helm chart template

Pairs with app fix making executor init non-blocking.

apps/base/customer1/trading-platform/execute-service/deployment.yaml

@@ -78,7 +78,7 @@ spec:
             periodSeconds: 30
           readinessProbe:
             httpGet:
-              path: /health
+              path: /health/ready
               port: 8002
             initialDelaySeconds: 5
             periodSeconds: 10

trading-platform/helm/trading-platform/templates/execute-service/deployment.yaml

@@ -79,7 +79,7 @@ spec:
             failureThreshold: 3
           readinessProbe:
             httpGet:
-              path: /health
+              path: /health/ready
               port: http
             initialDelaySeconds: 10
             periodSeconds: 5