feat: increase support for multiple time zones

* 优化实现方法

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

@@ -1,5 +1,6 @@
 import { eventHandler, readBody } from 'h3';
 import { verifyAccessToken } from '~/utils/jwt-utils';
+import { TIME_ZONE_OPTIONS } from '~/utils/mock-data';
 import { unAuthorizedResponse, useResponseSuccess } from '~/utils/response';
 import { setTimezone } from '~/utils/timezone-utils';
 
@@ -8,7 +9,14 @@ export default eventHandler(async (event) => {
   if (!userinfo) {
     return unAuthorizedResponse(event);
   }
-  const { timezone } = await readBody(event);
+  const body = await readBody<{ timezone?: unknown }>(event);
+  const timezone =
+    typeof body?.timezone === 'string' ? body.timezone : undefined;
+  const allowed = TIME_ZONE_OPTIONS.some((o) => o.timezone === timezone);
+  if (!timezone || !allowed) {
+    setResponseStatus(event, 400);
+    return useResponseError('Bad Request', 'Invalid timezone');
+  }
   setTimezone(timezone);
   return useResponseSuccess({});
 });