fix: 强充预检按平台/代理层级判断，代理自设强充在平台未设时生效

checkForceRechargeRequirement() 新增层级逻辑：平台（PackageSeries）的强充配置具有最高优先级；平台未设强充时，读取 order.SellerShopID 对应的 ShopSeriesAllocation 强充配置；两者均未设时返回 need_force_recharge=false（降级处理）。GetPurchaseCheck 复用同一函数，无需额外修改。

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/service/order/service.go

@@ -2123,20 +2123,27 @@ type ForceRechargeRequirement struct {
 func (s *Service) checkForceRechargeRequirement(ctx context.Context, result *purchase_validation.PurchaseValidationResult) *ForceRechargeRequirement {
 	defaultResult := &ForceRechargeRequirement{NeedForceRecharge: false}
 
-	// 1. 获取 seriesID
+	// 1. 获取 seriesID 和卖家店铺 ID
 	var seriesID *uint
 	var firstCommissionPaid bool
+	var sellerShopID uint
 
 	if result.Card != nil {
 		seriesID = result.Card.SeriesID
 		if seriesID != nil {
 			firstCommissionPaid = result.Card.IsFirstRechargeTriggeredBySeries(*seriesID)
 		}
+		if result.Card.ShopID != nil {
+			sellerShopID = *result.Card.ShopID
+		}
 	} else if result.Device != nil {
 		seriesID = result.Device.SeriesID
 		if seriesID != nil {
 			firstCommissionPaid = result.Device.IsFirstRechargeTriggeredBySeries(*seriesID)
 		}
+		if result.Device.ShopID != nil {
+			sellerShopID = *result.Device.ShopID
+		}
 	}
 
 	if seriesID == nil {
@@ -2169,7 +2176,7 @@ func (s *Service) checkForceRechargeRequirement(ctx context.Context, result *pur
 		}
 	}
 
-	// 5. 累计充值模式，检查是否启用强充
+	// 5. 累计充值模式，检查平台是否启用强充
 	if config.EnableForceRecharge {
 		forceAmount := config.ForceAmount
 		if forceAmount == 0 {
@@ -2182,6 +2189,23 @@ func (s *Service) checkForceRechargeRequirement(ctx context.Context, result *pur
 		}
 	}
 
+	// 6. 平台未设强充，查询卖家代理的 ShopSeriesAllocation，判断代理是否自设强充
+	// 仅在累计充值模式且平台未启用时，代理强充配置才生效
+	if sellerShopID > 0 {
+		agentAllocation, allocErr := s.shopSeriesAllocationStore.GetByShopAndSeries(ctx, sellerShopID, *seriesID)
+		if allocErr == nil && agentAllocation.EnableForceRecharge {
+			agentForceAmount := agentAllocation.ForceRechargeAmount
+			if agentForceAmount == 0 {
+				agentForceAmount = config.Threshold
+			}
+			return &ForceRechargeRequirement{
+				NeedForceRecharge:   true,
+				ForceRechargeAmount: agentForceAmount,
+				TriggerType:         model.OneTimeCommissionTriggerAccumulatedRecharge,
+			}
+		}
+	}
+
 	return defaultResult
 }