feat: add buy confirm

frontend/wechat/src/views/ArticleDetail.vue

@@ -88,6 +88,11 @@ const updateMediaSource = async () => {
 };
 
 const handleBuy = async () => {
+    // confirm
+    if (!confirm("确认购买该曲谱？")) {
+        return;
+    }
+
     if (buying.value) return;
     buying.value = true;
     try {
@@ -123,9 +128,12 @@ const handleBuy = async () => {
                     }
                 }
             );
-        } else {
+            return
-            alert("余额支付成功");
         }
+
+        alert("余额支付成功");
+        fetchArticle();
+        await updateMediaSource();
     } catch (error) {
         console.error("Failed to initiate payment:", error);
         alert("发起支付失败，请稍后重试");