fix: reliable source upload, build cancel, WordPress port 80 default

- Replace port-forward/netcat PVC upload with kubectl cp for integrity
- Add build cancellation API and session cleanup; deploy catches cancel
- Default port 80 for WordPress, PHP, and Laravel on create
- Build progress modal with cancel; Helm/K8s adjustments for deployments
- Update build and kubernetes specs

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/helm/cloudhost-app/templates/deployment.yaml

@@ -231,11 +231,6 @@ spec:
         - name: app-storage
           persistentVolumeClaim:
             claimName: {{ $name }}-storage
-        {{- if .Values.wordpress.enabled }}
-        - name: wp-content
-          persistentVolumeClaim:
-            claimName: {{ $name }}-wp-content
-        {{- end }}
         {{- if .Values.elasticsearch.enabled }}
         - name: app-logs
           emptyDir: {}