feat: convert Deployment to Rollout CRD with canary strategy

- Replace deployment.yaml with rollout.yaml
- Add canary-service.yaml for traffic splitting
- Add analysistemplate.yaml for Prometheus health checks
- Update HTTPRoute with dual backends (stable + canary)
- Update overlays with Rollout patches
- Add Rollout transformer configuration for Kustomize

apps/myapp/base/httproute.yaml

@@ -17,3 +17,5 @@ spec:
     backendRefs:
     - name: myapp
       port: 80
+    - name: myapp-canary
+      port: 80