Move the config package to a singleton pattern

internal/logging/logging.go

@@ -16,20 +16,21 @@ var (
 	logger Logger
 )
 
-func Init(appConfig *config.AppConfig) {
+func Init() {
+	cfg := config.Get()
 
 	lj := &lumberjack.Logger{
-		Filename:   filepath.Join(appConfig.LogDir, appConfig.LogFile),
-		MaxSize:    appConfig.LogMaxSizeMB,
-		MaxBackups: appConfig.LogMaxBackups,
-		MaxAge:     appConfig.LogMaxAgeDays,
-		Compress:   appConfig.LogCompression,
+		Filename:   filepath.Join(cfg.LogDir, cfg.LogFile),
+		MaxSize:    cfg.LogMaxSizeMB,
+		MaxBackups: cfg.LogMaxBackups,
+		MaxAge:     cfg.LogMaxAgeDays,
+		Compress:   cfg.LogCompression,
 	}
 
 	logger = Logger{
 		slog.New(
 			slog.NewJSONHandler(lj, &slog.HandlerOptions{
-				AddSource: appConfig.LogAddSource,
+				AddSource: cfg.LogAddSource,
 			}),
 		),
 	}