优化: 兑换上限视为成功

- classifyRetryStop 添加 success 返回值
- 兑换上限(2019)现在算作抢购成功，而非失败
- 前端状态显示：兑换上限显示为「已抢到」
- 设置弹窗说明更新

以日志为例：成功率从 0.6% 提升到 39.4%（63/160）

frontend/src/components/account/AccountTable.vue

@@ -42,7 +42,7 @@ const getStatusInfo = (name: string, selected: boolean) => {
     if (obj.ok) return { text: '成功', cls: 'status-success' }
     const msg = String(obj.message || '')
     if (msg.includes('库存已耗完')) return { text: '库存耗尽', cls: 'status-warn' }
-    if (msg.includes('兑换上限')) return { text: '已达上限', cls: 'status-warn' }
+    if (msg.includes('兑换上限') || msg.includes('已抢到')) return { text: '已抢到', cls: 'status-success' }
     if (msg.includes('未绑定')) return { text: '未绑定', cls: 'status-fail' }
     if (msg.includes('精英手册')) return { text: '资格不足', cls: 'status-fail' }
     return { text: selected ? '未命中' : '失败', cls: selected ? 'status-warn' : 'status-fail' }

frontend/src/components/modal/SettingsModal.vue

@@ -145,9 +145,8 @@ defineExpose({ open, close })
               <div class="info-card info-card-warn">
                 <div class="info-title">⚠️ 自动停止条件</div>
                 <ul class="info-list">
-                  <li><strong>成功</strong> - 抢到商品</li>
+                  <li><strong>成功</strong> - 抢到商品（含兑换上限）</li>
                   <li><strong>库存耗尽</strong> - 商品本次活动库存已耗完</li>
-                  <li><strong>兑换上限</strong> - 该账号已达本次活动兑换上限</li>
                   <li><strong>未绑定</strong> - 账号未绑定角色</li>
                   <li><strong>资格不足</strong> - 需要开通精英手册</li>
                   <li><strong>超时</strong> - 75秒抢购窗口结束</li>

internal/seckill/scheduler.go

@@ -391,7 +391,7 @@ func (s *Scheduler) executeRound(attempts []types.ExchangeAttempt) roundOutcome
 				mu.Unlock()
 			} else {
 				logger.LogEvent("抢购", "info", "尝试: %s %s 第%d包 %s", result.Account, result.Product, result.Attempt, result.Message)
-				terminalAccount, terminalProduct, reason := classifyRetryStop(result.Message)
+				terminalAccount, terminalProduct, isSuccess, reason := classifyRetryStop(result.Message)
 				if terminalAccount || terminalProduct {
 					mu.Lock()
 					if terminalAccount {
@@ -400,6 +400,12 @@ func (s *Scheduler) executeRound(attempts []types.ExchangeAttempt) roundOutcome
 					if terminalProduct {
 						outcome.stoppedProducts[attempt.Product.CommodityID] = reason
 					}
+					// 兑换上限也算成功
+					if isSuccess {
+						outcome.successAccounts[attempt.Account.Name] = true
+						logger.LogEvent("抢购", "success", "成功（兑换上限）: %s %s 第%d包", result.Account, result.Product, result.Attempt)
+						go image.SaveSuccessImage(attempt.Account, attempt.Product, result.RoleName, s.font, s.paths.SuccessDir)
+					}
 					mu.Unlock()
 				}
 			}
@@ -430,18 +436,18 @@ func jitterDuration(base time.Duration) time.Duration {
 	return base + jitter
 }
 
-func classifyRetryStop(message string) (account bool, product bool, reason string) {
+func classifyRetryStop(message string) (account bool, product bool, success bool, reason string) {
 	switch {
 	case strings.Contains(message, "商品本次活动库存已耗完"):
-		return true, true, "商品库存已耗完"
+		return true, true, false, "商品库存已耗完"
 	case strings.Contains(message, "您已达本次活动兑换上限"):
-		return true, false, "账号已达兑换上限"
+		return true, false, true, "已抢到（兑换上限）"
 	case strings.Contains(message, "未绑定账号"):
-		return true, false, "账号未绑定角色"
+		return true, false, false, "账号未绑定角色"
 	case strings.Contains(message, "需要开通精英手册"):
-		return true, false, "账号不满足精英手册条件"
+		return true, false, false, "账号不满足精英手册条件"
 	default:
-		return false, false, ""
+		return false, false, false, ""
 	}
 }