优化：百家乐押注面板显示押注人数，今日排行榜修正金币净收益统计

app/Services/UserCurrencyService.php

@@ -136,9 +136,10 @@ class UserCurrencyService
         return UserCurrencyLog::query()
             ->whereDate('created_at', $date)
             ->where('currency', $currency)
-            ->where('amount', '>', 0)                          // 只统计正向
+            // 计算净收益，包含正向与负向消耗
             ->selectRaw('user_id, SUM(amount) as total')
             ->groupBy('user_id')
+            ->havingRaw('SUM(amount) > 0') // 只有今日净收益为正数才能上榜
             ->orderByRaw('SUM(amount) DESC')
             ->limit($limit)
             ->get()