feat: 赞助页面支持 ?ratio=N 隐藏参数，金额倍数显示

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pages/sponsor.vue

@@ -5,6 +5,21 @@ useSeoMeta({
   title: `赞助 - ${siteConfig.siteName}`,
   description: '感谢您的支持，您的赞助将帮助我持续创作优质内容',
 })
+
+const route = useRoute()
+
+const ratio = computed(() => {
+  const v = Number(route.query.ratio)
+  return Number.isFinite(v) && v > 0 ? v : 0
+})
+
+function formatAmount(amount: string): string {
+  if (!ratio.value) return amount
+  const match = amount.match(/^([\d.]+)(.*)$/)
+  if (!match) return amount
+  const num = (parseFloat(match[1]) * ratio.value).toFixed(2)
+  return num + match[2]
+}
 </script>
 
 <template>
@@ -59,7 +74,7 @@ useSeoMeta({
             <div class="flex-1 min-w-0">
               <div class="font-semibold">{{ sponsor.name }}</div>
               <div class="text-sm text-muted-foreground">{{ sponsor.date }}</div>
-              <div v-if="sponsor.amount" class="text-sm font-medium text-primary mt-1">{{ sponsor.amount }}</div>
+              <div v-if="sponsor.amount" class="text-sm font-medium text-primary mt-1">{{ formatAmount(sponsor.amount) }}</div>
             </div>
           </div>
         </div>