Merge branch 'main' into feature/antigravity_auth

backend/internal/service/gateway_service.go

@@ -357,7 +357,10 @@ func (s *GatewayService) selectAccountForModelWithPlatform(ctx context.Context,
 	// 2. 获取可调度账号列表（单平台）
 	var accounts []Account
 	var err error
-	if groupID != nil {
+	if s.cfg.RunMode == config.RunModeSimple {
+		// 简易模式：忽略 groupID，查询所有可用账号
+		accounts, err = s.accountRepo.ListSchedulableByPlatform(ctx, platform)
+	} else if groupID != nil {
 		accounts, err = s.accountRepo.ListSchedulableByGroupIDAndPlatform(ctx, *groupID, platform)
 	} else {
 		accounts, err = s.accountRepo.ListSchedulableByPlatform(ctx, platform)
@@ -1226,6 +1229,12 @@ func (s *GatewayService) RecordUsage(ctx context.Context, input *RecordUsageInpu
 		log.Printf("Create usage log failed: %v", err)
 	}
 
+	if s.cfg != nil && s.cfg.RunMode == config.RunModeSimple {
+		log.Printf("[SIMPLE MODE] Usage recorded (not billed): user=%d, tokens=%d", usageLog.UserID, usageLog.TotalTokens())
+		s.deferredService.ScheduleLastUsedUpdate(account.ID)
+		return nil
+	}
+
 	// 根据计费类型执行扣费
 	if isSubscriptionBilling {
 		// 订阅模式：更新订阅用量（使用 TotalCost 原始费用，不考虑倍率）