chore: 初始化租户端（vben web-ele）

apps/backend-mock/utils/timezone-utils.ts

@@ -0,0 +1,9 @@
+let mockTimeZone: null | string = null;
+
+export const setTimezone = (timeZone: string) => {
+  mockTimeZone = timeZone;
+};
+
+export const getTimezone = () => {
+  return mockTimeZone;
+};