fix：对战房间分享文案动态写入完成

src/components/Header.vue

@@ -273,7 +273,7 @@ onBeforeUnmount(() => {
 /* 对战房间：整个胶囊作为分享按钮，靠右对齐 */
 .battle-room-number {
   margin-left: auto;
-  margin-right: 10rpx;
+  margin-right: 20rpx;
   display: flex;
   align-items: center;
   justify-content: center;

src/pages/battle-room.vue

@@ -261,9 +261,24 @@ const canClick = computed(() => {
   return true;
 });
 
+/**
+ * 根据对战类型和人数动态生成分享文案
+ * 1v1 / 默认 → "星球论箭，来一决高下敢否?"
+ * 2v2 → "2v2对抗赛，是兄弟来助我一把!"
+ * 3v3 → "3v3对抗赛，来了马上发车!"
+ * 乱斗 → "热血乱斗赛，敢来争锋?"
+ */
+const shareTitle = computed(() => {
+  const { battleType, count } = room.value;
+  if (battleType === 2) return '热血乱斗赛，敢来争锋?';
+  if (battleType === 1 && count === 4) return '2v2对抗赛，是兄弟来助我一把!';
+  if (battleType === 1 && count === 6) return '3v3对抗赛，来了马上发车!';
+  return '星球论箭，来一决高下敢否?';
+});
+
 onShareAppMessage(() => {
   return {
-    title: "邀请您进入房间对战",
+    title: shareTitle.value,
     path: "/pages/friend-battle?roomID=" + roomNumber.value,
     imageUrl: "",
   };