feat(distribution): 补齐退款加价回退、本站自卖与开通默认规则

退款时压缩卖方加价，人工/自动批次仅完结单可入账，号主收入进主站钱包；仲裁后重算释放并支持作废未入账 DS。开通时四种模式按默认生效，对外口径合并为 35/40/25，不再单独展示通道费。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/internal/modules/distribution/repository_test.go

@@ -166,6 +166,95 @@ func TestDistributionPaymentChannelAndSettlementBatch(t *testing.T) {
 	}
 }
 
+func TestCreateSettlementBatchSkipsRentingOrders(t *testing.T) {
+	db := distributionTestDB(t)
+	repo := NewRepository(db)
+	site := model.DistributionSite{SiteCode: "ds_renting", SiteName: "租赁中批次站", Domain: "ds-renting.example.com", Status: "active"}
+	if err := db.Create(&site).Error; err != nil {
+		t.Fatal(err)
+	}
+	rule := model.DistributionRuleVersion{SiteID: &site.ID, Mode: ModeTwoPartyDistributorReceive, Version: 1, Status: "active", EffectiveFrom: time.Now().Add(-time.Hour)}
+	if err := db.Create(&rule).Error; err != nil {
+		t.Fatal(err)
+	}
+	order := model.RentalOrder{OrderNo: "DS-RENTING-1", ListingID: 1, AccountID: 2, OwnerID: 3, RenterID: 4, Status: "renting", DistributionSiteID: &site.ID, DistributionRuleVersionID: &rule.ID}
+	if err := db.Create(&order).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Create(&model.DistributionOrderFinancial{
+		OrderID: order.ID, SiteID: site.ID, RuleVersionID: rule.ID, GrossPaidAmountCent: 10000, SettlementStatus: "pending",
+	}).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Create(&model.DistributionOrderParty{
+		OrderID: order.ID, SiteID: site.ID, PartyRole: "distributor_receive", PartyType: PartyTypeSite, PartyID: site.ID, IncomeAmountCent: 1400,
+	}).Error; err != nil {
+		t.Fatal(err)
+	}
+	batch, err := repo.CreateSettlementBatch(t.Context(), 0, CreateSettlementBatchRequest{
+		SiteID: site.ID, PeriodStart: time.Now().Add(-time.Hour), PeriodEnd: time.Now().Add(time.Hour),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if batch.TotalAmountCent != 0 {
+		t.Fatalf("renting order must not enter DS batch, total=%d", batch.TotalAmountCent)
+	}
+}
+
+func TestCancelSettlementBatchUnblocksAutoRelease(t *testing.T) {
+	db := distributionTestDB(t)
+	repo := NewRepository(db)
+	site := model.DistributionSite{SiteCode: "ds_cancel", SiteName: "作废批次站", Domain: "ds-cancel.example.com", Status: "active"}
+	if err := db.Create(&site).Error; err != nil {
+		t.Fatal(err)
+	}
+	rule := model.DistributionRuleVersion{SiteID: &site.ID, Mode: ModeTwoPartyDistributorReceive, Version: 1, Status: "active", EffectiveFrom: time.Now().Add(-time.Hour)}
+	if err := db.Create(&rule).Error; err != nil {
+		t.Fatal(err)
+	}
+	order := model.RentalOrder{OrderNo: "DS-CANCEL-1", ListingID: 1, AccountID: 2, OwnerID: 3, RenterID: 4, Status: "completed", DistributionSiteID: &site.ID, DistributionRuleVersionID: &rule.ID}
+	if err := db.Create(&order).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Create(&model.DistributionOrderFinancial{
+		OrderID: order.ID, SiteID: site.ID, RuleVersionID: rule.ID, GrossPaidAmountCent: 10000, SettlementStatus: "pending",
+	}).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Create(&model.DistributionOrderParty{
+		OrderID: order.ID, SiteID: site.ID, PartyRole: "distributor_receive", PartyType: PartyTypeSite, PartyID: site.ID, IncomeAmountCent: 1400,
+	}).Error; err != nil {
+		t.Fatal(err)
+	}
+	batch, err := repo.CreateSettlementBatch(t.Context(), 0, CreateSettlementBatchRequest{
+		SiteID: site.ID, PeriodStart: time.Now().Add(-time.Hour), PeriodEnd: time.Now().Add(time.Hour),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	cancelled, err := repo.CancelSettlementBatch(t.Context(), 0, batch.ID)
+	if err != nil || cancelled.Status != "cancelled" {
+		t.Fatalf("cancel = %#v err=%v", cancelled, err)
+	}
+	var leftover int64
+	if err := db.Model(&model.DistributionSettlementItem{}).Where("batch_id = ?", batch.ID).Count(&leftover).Error; err != nil || leftover != 0 {
+		t.Fatalf("cancelled batch must drop items, leftover=%d err=%v", leftover, err)
+	}
+	if _, err := repo.CancelSettlementBatch(t.Context(), 0, batch.ID); err != ErrBatchNotCancellable {
+		t.Fatalf("second cancel err = %v", err)
+	}
+	again, err := repo.CreateSettlementBatch(t.Context(), 0, CreateSettlementBatchRequest{
+		SiteID: site.ID, PeriodStart: time.Now().Add(-time.Hour), PeriodEnd: time.Now().Add(time.Hour),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if again.TotalAmountCent != 1400 {
+		t.Fatalf("cancelled items should be eligible again, total=%d", again.TotalAmountCent)
+	}
+}
+
 func TestScopeSiteIDRestrictsBoundMember(t *testing.T) {
 	db := distributionTestDB(t)
 	repo := NewRepository(db)
@@ -448,8 +537,16 @@ func TestOnboardSiteDoesNotDumpCatalog(t *testing.T) {
 	if err := db.Where("user_id = 0 AND distribution_site_id = ?", onboardResp.Site.ID).First(&treasury).Error; err != nil {
 		t.Fatalf("onboard must create site treasury wallet, err=%v", err)
 	}
-	if onboardResp.Rule.Status != "draft" || onboardResp.Rule.DistributorReceiveRatio != 0 || onboardResp.Rule.PlatformSellRatio != 0 {
-		t.Fatalf("onboard must not activate default 3.5/4 split, got %+v", onboardResp.Rule)
+	if onboardResp.Rule.Status != "active" || onboardResp.Rule.Mode != ModeTwoPartyDistributorReceive ||
+		onboardResp.Rule.DistributorReceiveRatio != 35 || onboardResp.Rule.PlatformSellRatio != 40 || onboardResp.Rule.ServiceFeeValue != 25 {
+		t.Fatalf("onboard receive rule should be default active 35/40/25, got %+v", onboardResp.Rule)
+	}
+	var extraRules []model.DistributionRuleVersion
+	if err := db.Where("site_id = ? AND status = ?", onboardResp.Site.ID, "active").Order("mode ASC").Find(&extraRules).Error; err != nil {
+		t.Fatal(err)
+	}
+	if len(extraRules) != 4 {
+		t.Fatalf("onboard should activate all four default modes, got %d", len(extraRules))
 	}
 }