feat: 为各个页面补全标题与SEO

app/layouts/default.vue

@@ -12,6 +12,17 @@
   </el-container>
 </template>
 
+<script setup lang="ts">
+  const { t } = useI18n();
+
+  useHead(() => {
+    const siteTitle = t('company-name');
+    return {
+      titleTemplate: (title) => (title ? `${title} - ${siteTitle}` : siteTitle),
+    };
+  });
+</script>
+
 <style scoped>
   .app-container {
     display: flex;

app/layouts/preview.vue

@@ -3,3 +3,14 @@
     <slot />
   </div>
 </template>
+
+<script setup lang="ts">
+  const { t } = useI18n();
+
+  useHead(() => {
+    const siteTitle = `${$t('page-title.preview')} - ${t('company-name')}`;
+    return {
+      title: siteTitle,
+    };
+  });
+</script>