feat: add config download functionality

src/test/ConfigBuilder.test.ts

@@ -0,0 +1,11 @@
+import { describe, it, expect } from 'vitest';
+import { ConfigBuilder } from '../builders/ConfigBuilder';
+
+describe('ConfigBuilder', () => {
+  describe('generateFilename', () => {
+    it('should generate filename with correct format', () => {
+      const filename = ConfigBuilder.generateFilename();
+      expect(filename).toMatch(/^config_\d{2}-\d{2}-\d{2}-\d{4}\.json\.xml$/);
+    });
+  });
+});