feat: scale deployments to single replica

- Set backend replicas from 2 to 1
- Set frontend replicas from 2 to 1
- Update deployment manifests for development efficiency
- Application fully functional with single replicas

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

deploy/k8s/backend-deployment.yaml

@@ -19,7 +19,7 @@ kind: Deployment
 metadata:
   name: adopt-a-street-backend
 spec:
-  replicas: 2
+  replicas: 1
   selector:
     matchLabels:
       app: backend

deploy/k8s/frontend-deployment.yaml

@@ -19,7 +19,7 @@ kind: Deployment
 metadata:
   name: adopt-a-street-frontend
 spec:
-  replicas: 2
+  replicas: 1
   selector:
     matchLabels:
       app: frontend