赠金币通知：发送者/接收者在包厢窗口显示，其他人在公屏显示（利用 to_user 路由机制）

app/Http/Controllers/ChatController.php

@@ -1178,22 +1178,23 @@ class ChatController extends Controller
         $sender->decrement('jjb', $amount);
         $receiver->increment('jjb', $amount);
 
-        // 广播「系统传音」条目至全房间
-        $sysMsg = [
+        // 广播一条消息：发送者/接收者路由到 say2（下方包厢），其他人路由到 say1（公屏）
+        // 原理：前端 isRelatedToMe = isMe || to_user===me → say2；否则 → say1
+        $giftMsg = [
             'id' => $this->chatState->nextMessageId($roomId),
             'room_id' => $roomId,
-            'from_user' => '系统传音',
-            'to_user' => '大家',
-            'content' => "💝 【{$sender->username}】 向 【{$toName}】 赠送了 {$amount} 金币！",
+            'from_user' => $sender->username,
+            'to_user' => $toName,
+            'content' => "悄悄赠送给你 {$amount} 金币！💝",
             'is_secret' => false,
             'font_color' => '#b45309',
             'action' => '',
             'sent_at' => now()->toDateTimeString(),
         ];
 
-        $this->chatState->pushMessage($roomId, $sysMsg);
-        broadcast(new MessageSent($roomId, $sysMsg));
-        SaveMessageJob::dispatch($sysMsg);
+        $this->chatState->pushMessage($roomId, $giftMsg);
+        broadcast(new MessageSent($roomId, $giftMsg));
+        SaveMessageJob::dispatch($giftMsg);
 
         return response()->json([
             'status' => 'success',