chore: 初始化租户端（vben web-ele）

packages/@core/composables/src/use-is-mobile.ts

@@ -0,0 +1,7 @@
+import { breakpointsTailwind, useBreakpoints } from '@vueuse/core';
+
+export function useIsMobile() {
+  const breakpoints = useBreakpoints(breakpointsTailwind);
+  const isMobile = breakpoints.smaller('md');
+  return { isMobile };
+}