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/canary-service.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: myapp-canary
+  labels:
+    app: myapp
+    managed-by: argocd
+spec:
+  selector:
+    app: myapp
+  ports:
+  - port: 80
+    targetPort: 80