feat: increase support for multiple time zones

* 优化实现方法

apps/backend-mock/api/timezone/getTimezoneOptions.ts

@@ -0,0 +1,7 @@
+import { eventHandler } from 'h3';
+import { TIME_ZONE_OPTIONS } from '~/utils/mock-data';
+import { useResponseSuccess } from '~/utils/response';
+
+export default eventHandler(() => {
+  return useResponseSuccess(TIME_ZONE_OPTIONS);
+});