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/overlays/production/kustomization.yaml

@@ -7,7 +7,7 @@ resources:
 - ../../base
 
 patches:
-- path: deployment-patch.yaml
+- path: rollout-patch.yaml
 - path: httproute-patch.yaml
 
 images:

apps/myapp/overlays/production/rollout-patch.yaml

@@ -1,9 +1,15 @@
-apiVersion: apps/v1
-kind: Deployment
+apiVersion: argoproj.io/v1alpha1
+kind: Rollout
 metadata:
   name: myapp
 spec:
   replicas: 2
+  strategy:
+    canary:
+      trafficRouting:
+        plugins:
+          argoproj-labs/gatewayAPI:
+            namespace: myapp-production
   template:
     spec:
       containers: