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Adds an OTEL_ENABLED opt-in that assembles kaya-otel's OTelMixin into the app, exporting HTTP/WebSocket traces and request metrics to an OTLP/HTTP collector. Configured through OTEL_SERVICE_NAME, OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_HEADERS and OTEL_EXCLUDED_PATHS (defaults to the /api/health probe endpoint). kaya-otel is an optional 'otel' extra imported lazily, so default installs and the test suite do not need the OpenTelemetry packages. The kaya dependencies are bumped to 0.0.4, which kaya-otel requires.