style: apply gofmt modernization fixes

pkg/gotenberg/attrs.go

@@ -2,6 +2,7 @@ package gotenberg
 
 import (
 	"net/url"
+	"slices"
 )
 
 // maxAttrRunes bounds the length of a string span attribute to keep payload
@@ -45,10 +46,8 @@ func RedactURL(raw string) string {
 // a span attribute or metric dimension bounded even when an upstream tool
 // introduces a new enum value.
 func MapEnum(value string, allowed ...string) string {
-	for _, candidate := range allowed {
-		if value == candidate {
-			return value
-		}
+	if slices.Contains(allowed, value) {
+		return value
 	}
 	return "other"
 }

pkg/modules/chromium/chromium.go

@@ -1029,8 +1029,8 @@ func conversionInputAttrs(ctx context.Context, url string) []attribute.KeyValue
 		attrs = append(attrs, attribute.Int("gotenberg.conversion.input.files.count", apiCtx.FileCount()))
 	}
 
-	if strings.HasPrefix(url, "file://") {
-		if info, err := os.Stat(strings.TrimPrefix(url, "file://")); err == nil {
+	if after, ok := strings.CutPrefix(url, "file://"); ok {
+		if info, err := os.Stat(after); err == nil {
 			attrs = append(attrs, attribute.Int64("gotenberg.conversion.input.html.bytes", info.Size()))
 		}
 	}

pkg/modules/chromium/network_aggregate_test.go

@@ -66,7 +66,7 @@ func TestNetworkAggregate_Snapshot(t *testing.T) {
 
 func TestNetworkAggregate_OriginCap(t *testing.T) {
 	a := newNetworkAggregate()
-	for i := 0; i < maxTrackedOrigins+50; i++ {
+	for i := range maxTrackedOrigins + 50 {
 		a.onResponseReceived(&network.EventResponseReceived{
 			RequestID: network.RequestID(fmt.Sprintf("r%d", i)),
 			Response:  &network.Response{URL: fmt.Sprintf("https://host%d.example.com/x", i)},
@@ -80,7 +80,7 @@ func TestNetworkAggregate_OriginCap(t *testing.T) {
 func TestNetworkAggregate_ConcurrentSafe(t *testing.T) {
 	a := newNetworkAggregate()
 	var wg sync.WaitGroup
-	for i := 0; i < 100; i++ {
+	for i := range 100 {
 		wg.Add(1)
 		go func(i int) {
 			defer wg.Done()

pkg/modules/pdfengines/fallback_test.go

@@ -45,7 +45,6 @@ func TestRunWithFallback_FirstSucceeds(t *testing.T) {
 			calls++
 			return "ok", nil
 		}, wrapTest)
-
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -85,7 +84,6 @@ func TestRunWithFallback_SecondSucceeds(t *testing.T) {
 			}
 			return "ok", nil
 		}, wrapTest)
-
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}