refactor: rewrite observability mod

[PsiACE]

Summary

clean code, refactor observability with logfire

Solution Description

test with jaeger:

def configure_observability() -> None:
    os.environ.setdefault("OTEL_EXPORTER_OTLP_PROTOCOL", "http/protobuf")
    os.environ.setdefault(
        "OTEL_EXPORTER_OTLP_TRACES_ENDPOINT",
        "http://127.0.0.1:4318/v1/traces",
    )
    os.environ.setdefault("OTEL_SERVICE_NAME", "seekvfs-local-demo")
    os.environ.setdefault("LOGFIRE_IGNORE_NO_CONFIG", "1")
    logfire.configure(send_to_logfire=False)

[Evenss]

This looks like a good optimization. LGTM