feat: 完善平台总后台模块

frontend/platform_admin/src/hooks/themes.ts

@@ -0,0 +1,12 @@
+import { computed } from 'vue';
+import { useAppStore } from '@/store';
+
+export default function useThemes() {
+  const appStore = useAppStore();
+  const isDark = computed(() => {
+    return appStore.theme === 'dark';
+  });
+  return {
+    isDark,
+  };
+}