- GrafanaTab/PrometheusTab: use store.get_server(alias) to get server
dict instead of passing (alias, store) to client constructors
- Fix PrometheusTab: targets() and alerts() method names + parse response
- Fix GrafanaTab: build dashboard URL from client.base_url
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>