infra: add logging wrapping

Resolves issues with gcp cloud logging quirks such as field names

go/cmd/transcodebackfill/main.go

@@ -5,10 +5,11 @@ package main
 
 import (
 	"context"
-	"log/slog"
 	"os"
 	"time"
 
+	"github.com/flowy-live/llink/internal/utils/flog"
+
 	"cloud.google.com/go/firestore"
 	"cloud.google.com/go/storage"
 	"google.golang.org/api/iterator"
@@ -27,7 +28,7 @@ func main() {
 
 	storageClient, err := storage.NewClient(ctx)
 	if err != nil {
-		slog.Error("failed to create GCS client", "error", err)
+		flog.Error("failed to create GCS client", "error", err)
 		os.Exit(1)
 	}
 	defer storageClient.Close()
@@ -40,7 +41,7 @@ func main() {
 	gcpProject := utils.MustGetEnv("GCP_PROJECT")
 	fs, err := firestore.NewClient(ctx, gcpProject)
 	if err != nil {
-		slog.Error("failed to create Firestore client", "error", err)
+		flog.Error("failed to create Firestore client", "error", err)
 		os.Exit(1)
 	}
 	defer fs.Close()
@@ -49,7 +50,7 @@ func main() {
 	stats, err := run(ctx, fs, depotSvc)
 	elapsed := time.Since(started)
 
-	slog.Info("transcode_backfill_summary",
+	flog.Info("transcode_backfill_summary",
 		"scanned", stats.scanned,
 		"media", stats.media,
 		"transcoded", stats.transcoded,
@@ -61,7 +62,7 @@ func main() {
 	)
 
 	if err != nil {
-		slog.Error("transcode backfill aborted", "error", err)
+		flog.Error("transcode backfill aborted", "error", err)
 		os.Exit(1)
 	}
 	if stats.failures > 0 {
@@ -116,7 +117,7 @@ func run(ctx context.Context, fs *firestore.Client, depotSvc depot.Service) (sta
 		switch {
 		case result.Err != nil:
 			s.failures++
-			slog.Error("transcode_backfill_failure",
+			flog.Error("transcode_backfill_failure",
 				"particleID", doc.Ref.ID,
 				"path", doc.Ref.Path,
 				"error", result.Err,
@@ -129,7 +130,7 @@ func run(ctx context.Context, fs *firestore.Client, depotSvc depot.Service) (sta
 			s.skippedNonMedia++
 		default:
 			s.transcoded++
-			slog.Info("transcode_backfill_progress",
+			flog.Info("transcode_backfill_progress",
 				"particleID", doc.Ref.ID,
 				"transcodedObjectID", result.TranscodedObjectID,
 				"outputMime", result.OutputMimeType,