refactor: remove hardcoded namespaces from Kubernetes manifests

- Remove namespace: adopt-a-street from all metadata sections
- Update CouchDB NODENAME to use namespace-agnostic format
- Make all manifests deployable to any namespace
- Maintain service names and selectors for functionality
- All manifests validated with kubectl dry-run

Now manifests can be deployed to any namespace using:
kubectl apply -n <namespace> -f deploy/k8s/

🤖 Generated with [AI Assistant]

Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

deploy/k8s/ingress.yaml

@@ -2,7 +2,6 @@ apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
   name: adopt-a-street-ingress
-  namespace: adopt-a-street
   annotations:
     # Uncomment the appropriate ingress class for your cluster
     kubernetes.io/ingress.class: "traefik"  # For Traefik