Index exchangeId from Camel MDC (camel.exchangeId) as a top-level
keyword field in OpenSearch log indices. Add exchangeId filter to
the log query API and frontend hook. Show a LogViewer on the
ExchangeDetail page filtered to that exchange's logs, with search
input and level filter pills.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>