fix(otel): use otel.SetLoggerProvider instead of deprecated log/global

OpenTelemetry v1.47 deprecates go.opentelemetry.io/otel/log/global, so
golangci-lint's staticcheck (SA1019) fails pre-commit on every PR.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012GZcP1B9UALgvE785GL8Jb

otel.go

@@ -13,7 +13,6 @@ import (
 	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
 	"go.opentelemetry.io/otel/exporters/stdout/stdoutlog"
-	"go.opentelemetry.io/otel/log/global"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/sdk/log"
 	"go.opentelemetry.io/otel/sdk/metric"
@@ -86,7 +85,7 @@ func SetupOTelSDK(ctx context.Context, enabled bool, serviceName, buildVersion,
 	processor := log.NewSimpleProcessor(logExporter)
 	logProvider := log.NewLoggerProvider(log.WithProcessor(processor))
 
-	global.SetLoggerProvider(logProvider)
+	otel.SetLoggerProvider(logProvider)
 	shutdownFuncs = append(shutdownFuncs, logProvider.Shutdown)
 
 	exp, err := otlpmetrichttp.New(ctx, otlpmetrichttp.WithHTTPClient(otlpHTTPClient()))