feat: 添加后退按钮组件并更新认证路由和视图

src/components/back-button.vue

@@ -0,0 +1,28 @@
+<script lang='ts' setup>
+import { chevronBackOutline } from "ionicons/icons";
+
+const { text = "返回" } = defineProps<{
+  text?: string;
+}>();
+const router = useRouter();
+
+function onBack() {
+  if (window.history.length > 1) {
+    router.back();
+  }
+  else {
+    router.replace("/");
+  }
+}
+</script>
+
+<template>
+  <button class="z-1 flex items-center" @click="onBack">
+    <slot name="icon">
+      <ion-icon :icon="chevronBackOutline" class="text-2xl" />
+    </slot>
+    <span v-if="text" class="text-base">{{ text }}</span>
+  </button>
+</template>
+
+<style lang='css' scoped></style>