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/

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

deploy/k8s/couchdb-statefulset.yaml

@@ -2,7 +2,6 @@ apiVersion: v1
 kind: Service
 metadata:
   name: adopt-a-street-couchdb
-  namespace: adopt-a-street
   labels:
     app: couchdb
 spec:
@@ -23,7 +22,6 @@ apiVersion: apps/v1
 kind: StatefulSet
 metadata:
   name: adopt-a-street-couchdb
-  namespace: adopt-a-street
 spec:
   serviceName: adopt-a-street-couchdb
   replicas: 1
@@ -70,7 +68,7 @@ spec:
                   name: adopt-a-street-secrets
                   key: COUCHDB_SECRET
             - name: NODENAME
-              value: couchdb@0.adopt-a-street-couchdb.adopt-a-street
+              value: couchdb@0.adopt-a-street-couchdb
             - name: ERL_FLAGS
               value: "+K true +A 4"
             - name: COUCHDB_SINGLE_NODE_ENABLED