feat: add explicit namespace resource to production Kubernetes overlay

- Add namespace.yaml to production overlay resources
- Ensure proper namespace creation in production deployments
- Improve Kubernetes resource management and isolation

k8s-kustomize/overlays/prod/kustomization.yaml

@@ -7,6 +7,7 @@ metadata:
 # Reference the base configuration
 resources:
   - ../../base
+  - namespace.yaml
 
 # Override namespace for production
 namespace: rxminder-prod

k8s-kustomize/overlays/prod/namespace.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: rxminder-prod
+  labels:
+    app: rxminder
+    environment: production
+    tier: prod
+    version: v1.0.0