fix: comprehensive Kubernetes configuration review and fixes

- Add namespace.yaml to create adopt-a-street namespace
- Add namespace to all resource metadata (Services, Deployments, StatefulSet, ConfigMap, Secrets, Ingress)
- Fix CouchDB NODENAME to proper StatefulSet format (adopt-a-street-couchdb-0.adopt-a-street-couchdb)
- Add missing environment variables (STRIPE, OPENAI, CouchDB connection pool settings)
- Fix duplicate Cloudinary variables between ConfigMap and Secrets
- Remove duplicate registry-secret.yaml file (security risk)
- Remove unused couchdb-configmap.yaml
- Complete rewrite of DEPLOYMENT_GUIDE.md with namespace-aware instructions
- Add comprehensive CHANGES.md documenting all fixes and rationale

Fixes address all HIGH and MEDIUM priority issues identified in configuration review:
- Namespace configuration (HIGH)
- Missing resources (HIGH)
- CouchDB NODENAME format (MEDIUM)
- Missing environment variables (MEDIUM)
- Duplicate files (MEDIUM)
- Documentation updates (MEDIUM)

All health checks verified, service discovery tested, and deployment process documented.

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

deploy/k8s/frontend-deployment.yaml

@@ -2,6 +2,7 @@ apiVersion: v1
 kind: Service
 metadata:
   name: adopt-a-street-frontend
+  namespace: adopt-a-street
   labels:
     app: frontend
 spec:
@@ -18,6 +19,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: adopt-a-street-frontend
+  namespace: adopt-a-street
 spec:
   replicas: 1
   selector: