refactor: 主题设置重构优化

src/App.vue

@@ -1,13 +1,8 @@
 <script setup lang="ts">
 import { onLaunch, onShow, onHide } from "@dcloudio/uni-app";
-import { useTheme } from "@/composables/useTheme";
-
-const { initTheme } = useTheme();
 
 onLaunch(() => {
   console.log("App Launch");
-  // 初始化主题
-  initTheme();
 });
 
 onShow(() => {