feat: add source locations to log entries

handlers/handlers.go

@@ -10,9 +10,9 @@ import (
 var log *slog.Logger
 
 func init() {
-	// it should print code line where call is occured; ai!
 	log = slog.New(slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{
-		Level: slog.LevelDebug,
+		Level:     slog.LevelDebug,
+		AddSource: true,
 	}))
 }