Add readiness probes to chart

I think it would be important to enable readiness probes in order to limit the maximum transaction loss in failover scenarios.

```
probes:
readiness:
type: streaming
maximumLag: 1Mi
failureThreshold: 30
periodSeconds: 10
```

Start by locating the chart's existing probe configuration and templates, then check how values are rendered into the generated manifests. Use the readiness configuration shown in the issue as the target and verify that the rendered chart includes it with the specified streaming, lag, threshold, and period settings.

Written by the indexing model from the issue text.