feat(logger,tracing): share OTel resource for logs and traces

Factor the resource detector list into internal/otlpresource so
the logger's OTLP provider and the trace provider describe the
same process with the same attributes.

OTLP log records now carry the full resource (process.pid,
service.name, service.version, host.*, os.*, etc.) instead of
no resource attributes at all.

logger/logger.go

@@ -36,6 +36,8 @@ import (
 
 	slogtraceid "github.com/remychantenay/slog-otel"
 	slogmulti "github.com/samber/slog-multi"
+	"go.ntppool.org/common/internal/otlpresource"
+	"go.ntppool.org/common/version"
 	"go.opentelemetry.io/contrib/bridges/otelslog"
 	"go.opentelemetry.io/otel/log/global"
 	otellog "go.opentelemetry.io/otel/sdk/log"
@@ -167,9 +169,18 @@ func setupOtlpLogger() *slog.Logger {
 			otellog.WithExportMaxBatchSize(512),
 		)
 
+		// Build the shared OTel resource (process.pid, host.*, service.name
+		// from OTEL_SERVICE_NAME, service.version, etc.). Environment is only
+		// known to the tracing package and is intentionally omitted here; see
+		// common/internal/otlpresource.
+		res, _ := otlpresource.New(context.Background(), Setup(), otlpresource.Options{
+			ServiceVersion: version.Version(),
+		})
+
 		// Create logger provider
 		provider := otellog.NewLoggerProvider(
 			otellog.WithProcessor(processor),
+			otellog.WithResource(res),
 		)
 
 		// Set global provider