sova-observability 0.1.0

HTTP RED metrics (Prometheus) + optional OpenTelemetry / Elasticsearch logs for Sova.

app.use_middleware(request_id());
app.install(
    Observability::new()
        .with_elasticsearch() // ELASTICSEARCH_URL → bulk ship tracing logs
);
app.use_middleware(logger());

Declarative toggles also work via [observability] in sova.toml (metrics_path, otel, elasticsearch) when not set on the builder.