feat: store layer with file CRUD

internal/store/store_test.go

@@ -0,0 +1,22 @@
+package store
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestOpen(t *testing.T) {
+	dir := t.TempDir()
+	dbPath := filepath.Join(dir, "test.db")
+
+	s, err := Open(dbPath)
+	if err != nil {
+		t.Fatalf("Open failed: %v", err)
+	}
+	defer s.Close()
+
+	if _, err := os.Stat(dbPath); os.IsNotExist(err) {
+		t.Error("Database file not created")
+	}
+}