feat(enterprise): Add OTEL logs export with span_id correlation

- Add ENTERPRISE_OTEL_LOGS_ENABLED and ENTERPRISE_OTLP_LOGS_ENDPOINT config options
- Implement EnterpriseLoggingHandler for log record translation with trace/span ID parsing
- Add LoggerProvider and BatchLogRecordProcessor for OTLP log export
- Correlate telemetry logs with spans via span_id_source parameter
- Attach log handler during enterprise telemetry initialization

api/extensions/ext_enterprise_telemetry.py

@@ -37,6 +37,7 @@ def init_app(app: DifyApp) -> None:
 
     _exporter = EnterpriseExporter(dify_config)
     atexit.register(_exporter.shutdown)
+    _exporter.attach_log_handler()
 
     # Import to trigger @signal.connect decorator registration
     import enterprise.telemetry.event_handlers  # noqa: F401  # type: ignore[reportUnusedImport]