fix: add config and logger, cleanup

internal/logger/logger.go

@@ -0,0 +1,31 @@
+package logger
+
+import (
+	"log/slog"
+	"os"
+	"strings"
+)
+
+// Setup initializes the global logger based on config
+func Setup(level string) {
+	var logLevel slog.Level
+
+	switch strings.ToUpper(level) {
+	case "DEBUG":
+		logLevel = slog.LevelDebug
+	case "WARN":
+		logLevel = slog.LevelWarn
+	case "ERROR":
+		logLevel = slog.LevelError
+	default:
+		logLevel = slog.LevelInfo
+	}
+
+	// Create a structured text handler (easier to read than JSON in terminal)
+	handler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
+		Level: logLevel,
+	})
+	
+	logger := slog.New(handler)
+	slog.SetDefault(logger)
+}