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/rollout-patch.yaml

@@ -0,0 +1,23 @@
+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:
+      - name: myapp
+        resources:
+          requests:
+            memory: "256Mi"
+            cpu: "200m"
+          limits:
+            memory: "512Mi"
+            cpu: "500m"