fix(invitation): 邀请返利改用实际结算利润并修正提号基准

backend/internal/modules/pickup/repository.go

@@ -308,8 +308,9 @@ func (r *Repository) Complete(ctx context.Context, pickupID uint64, req Complete
 		}
 
 		// 邀请返利：线下提号不走正常订单结账流程，必须在这里补发号主（卖家）侧返利，
-		// 否则号主邀请人永远拿不到提号产生的分成。基数按提号利润对半（与租赁订单卖家侧口径一致）。
-		if grossBasisCent := pickup.ProfitAmountCent; grossBasisCent > 0 {
+		// 否则号主邀请人永远拿不到提号产生的分成。
+		// 基准取「网站加价」与「线下利润」的较小值，避免按虚高的单一利润口径多算。
+		if grossBasisCent := pickupRebateGrossBasis(pickup.WebsiteProfitCent, pickup.ProfitAmountCent); grossBasisCent > 0 {
 			sellerSiteID := uint64(0)
 			if listing.DistributionSiteID != nil {
 				sellerSiteID = *listing.DistributionSiteID
@@ -1923,6 +1924,20 @@ func maxPickupCent(a, b int64) int64 {
 	return b
 }
 
+// pickupRebateGrossBasis 取网站加价与线下利润的较小值，负数按 0 处理。
+func pickupRebateGrossBasis(websiteProfitCent, offlineProfitCent int64) int64 {
+	if websiteProfitCent < 0 {
+		websiteProfitCent = 0
+	}
+	if offlineProfitCent < 0 {
+		offlineProfitCent = 0
+	}
+	if websiteProfitCent < offlineProfitCent {
+		return websiteProfitCent
+	}
+	return offlineProfitCent
+}
+
 func normalizePaging(page, pageSize int) (int, int) {
 	if page < 1 {
 		page = 1

backend/internal/modules/pickup/repository_test.go

@@ -376,6 +376,22 @@ func TestRepositoryCompletePickupAwardsSellerInvitationRebate(t *testing.T) {
 	}
 
 	listing := seedAvailableListing(t, db, "LST-REBATE-001", "返利提号账号", false)
+	// 网站加价 40 元、线下利润 100 元：返利基准必须取较小的 40 元。
+	priceSummary, err := json.Marshal(map[string]any{
+		"price_breakdown": map[string]any{
+			"seller_coin_base_price": 60,
+			"seller_total_price":     60,
+			"platform_markup_amount": 40,
+			"consumable_price":       0,
+		},
+	})
+	if err != nil {
+		t.Fatalf("构造价格快照失败: %v", err)
+	}
+	if err := db.Model(&model.GameAccount{}).Where("id = ?", listing.AccountID).
+		Update("asset_summary", datatypes.JSON(priceSummary)).Error; err != nil {
+		t.Fatalf("更新账号价格快照失败: %v", err)
+	}
 	// 距提号完成 2 天 => 首月 60% 档；Truncate 到整秒避免 DATETIME(0) 四舍五入影响天数计算。
 	verifiedAt := time.Now().AddDate(0, 0, -2).Truncate(time.Second)
 	if err := db.Create(&model.UserInvitation{
@@ -420,9 +436,9 @@ func TestRepositoryCompletePickupAwardsSellerInvitationRebate(t *testing.T) {
 	if rebate.OrderNo != pickup.PickupNo {
 		t.Fatalf("返利单据号 = %q, want %q", rebate.OrderNo, pickup.PickupNo)
 	}
-	// 基数 = 提号利润 10000 对半 = 5000，首月 60% = 3000
-	assertInt64(t, "提号返利单边基数", rebate.SingleSideBasisCent, 5000)
-	assertInt64(t, "提号返利金额", rebate.RebateAmountCent, 3000)
+	// 基数 = min(网站加价 4000, 线下利润 10000) 对半 = 2000，首月 60% = 1200
+	assertInt64(t, "提号返利单边基数", rebate.SingleSideBasisCent, 2000)
+	assertInt64(t, "提号返利金额", rebate.RebateAmountCent, 1200)
 
 	var wallet model.WalletLedger
 	if err := db.Where("biz_type = ? AND biz_no = ?", "invite_rebate", pickup.PickupNo).First(&wallet).Error; err != nil {
@@ -431,7 +447,29 @@ func TestRepositoryCompletePickupAwardsSellerInvitationRebate(t *testing.T) {
 	if wallet.UserID != inviter.ID {
 		t.Fatalf("返利入账用户 = %d, want %d", wallet.UserID, inviter.ID)
 	}
-	assertInt64(t, "提号返利入账金额", wallet.AmountCent, 3000)
+	assertInt64(t, "提号返利入账金额", wallet.AmountCent, 1200)
+}
+
+func TestPickupRebateGrossBasisTakesLowerProfit(t *testing.T) {
+	cases := []struct {
+		name           string
+		websiteProfit  int64
+		offlineProfit  int64
+		wantGrossBasis int64
+	}{
+		{name: "网站加价更低", websiteProfit: 4000, offlineProfit: 10000, wantGrossBasis: 4000},
+		{name: "线下利润更低", websiteProfit: 10000, offlineProfit: 4000, wantGrossBasis: 4000},
+		{name: "线下利润为零", websiteProfit: 10000, offlineProfit: 0, wantGrossBasis: 0},
+		{name: "负数归零", websiteProfit: -1, offlineProfit: 4000, wantGrossBasis: 0},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := pickupRebateGrossBasis(tc.websiteProfit, tc.offlineProfit); got != tc.wantGrossBasis {
+				t.Fatalf("pickupRebateGrossBasis(%d, %d) = %d, want %d",
+					tc.websiteProfit, tc.offlineProfit, got, tc.wantGrossBasis)
+			}
+		})
+	}
 }
 
 func TestRepositoryCompletePlatformManagedPickupUsesOfflineSettlement(t *testing.T) {
@@ -1145,4 +1183,3 @@ func TestRepositoryUpdateThirdPartyOrderNo(t *testing.T) {
 		}
 	})
 }
-