OpenTelemetry model

Auditaur uses OpenTelemetry concepts for resources, logs, traces, spans, span events, links, and attributes. Metrics are reserved in the schema but ingestion is still planned.

Auditaur-specific records, such as Tauri IPC calls and frontend errors, are additive. Auditaur is also a local OpenTelemetry sink: generic spans and logs emitted by app code or third-party libraries should still be preserved and queryable even when they do not contain Tauri-specific attributes.