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/image-pull-secret.yaml

@@ -2,7 +2,6 @@ apiVersion: v1
 kind: Secret
 metadata:
   name: regcred
-  namespace: adopt-a-street
 type: kubernetes.io/dockerconfigjson
 data:
   .dockerconfigjson: eyJhdXRocyI6eyJnaXRlYS1odHRwLnRhaWxkYjM0OTQudHMubmV0Ijp7InVzZXJuYW1lIjoid2lsbCIsInBhc3N3b3JkIjoiW1lPVVJfR0lURUFfUEFTU1dPUkRdIiwiYXV0aCI6IltBVVRIX1RPS0VOXSJ9fX0=