fix: 修复钻石充值发放到错误字段的问题

- 将diamond奖励类型从Money2改为Money字段
- 移除废弃的Money2奖励分支
- 修复GoodsService中Distinct排序警告

server/HoneyBox/src/HoneyBox.Core/Services/GoodsService.cs

@@ -693,16 +693,18 @@ public class GoodsService : IGoodsService
     /// </summary>
     private async Task<List<string>> GetJoinUsersAsync(int goodsId, int goodsNum, int orderType)
     {
+        // 使用子查询获取每个用户的最新订单ID，然后按此排序
         var userIds = await _dbContext.OrderItems
             .Where(oi => oi.GoodsId == goodsId
                 && oi.Num == goodsNum
                 && oi.ShangId >= ShangCountIdRange[0]
                 && oi.ShangId <= ShangCountIdRange[1]
                 && oi.OrderType == orderType)
-            .OrderByDescending(oi => oi.Id)
+            .GroupBy(oi => oi.UserId)
-            .Select(oi => oi.UserId)
+            .Select(g => new { UserId = g.Key, MaxId = g.Max(x => x.Id) })
-            .Distinct()
+            .OrderByDescending(x => x.MaxId)
             .Take(5)
+            .Select(x => x.UserId)
             .ToListAsync();
 
         if (!userIds.Any())

server/HoneyBox/src/HoneyBox.Core/Services/PaymentNotifyService.cs

@@ -1156,7 +1156,7 @@ public class PaymentNotifyService : IPaymentNotifyService
             {
                 var rewardType = item.Type?.ToLower() switch
                 {
-                    "diamond" => 1,   // 钻石 -> Money2
+                    "diamond" => 2,   // 钻石 -> Money (余额就是钻石)
                     "balance" => 2,   // 余额 -> Money
                     "integral" => 4,  // 积分 -> Integral
                     "coupon" => 5,    // 优惠券
@@ -1222,22 +1222,7 @@ public class PaymentNotifyService : IPaymentNotifyService
 
         switch (rewardType)
         {
-            case 1: // 钻石 (Money2)
+            case 2: // 钻石/余额 (Money)
-                user.Money2 = (user.Money2 ?? 0) + value;
-                // 记录钻石变动
-                _dbContext.ProfitMoney2s.Add(new ProfitMoney2
-                {
-                    UserId = userId,
-                    ChangeMoney = value,
-                    Money = user.Money2 ?? 0,
-                    Type = 1,
-                    Content = source,
-                    ShareUid = 0,
-                    CreatedAt = DateTime.Now
-                });
-                return $"钻石+{value}";
-
-            case 2: // UU币/余额 (Money)
                 user.Money += value;
                 // 记录余额变动
                 _dbContext.ProfitMoneys.Add(new ProfitMoney
@@ -1250,7 +1235,7 @@ public class PaymentNotifyService : IPaymentNotifyService
                     ShareUid = 0,
                     CreatedAt = DateTime.Now
                 });
-                return $"余额+{value}";
+                return $"钻石+{value}";
 
             case 3: // 哈尼券/达达券 - 暂不支持，记录到积分
             case 4: // 积分 (Integral)