修复卖家商品价格展示

backend/internal/modules/listing/service_test.go

@@ -40,3 +40,37 @@ func TestValidateRequestRequiresDepositAboveConsumables(t *testing.T) {
 		t.Fatalf("expected valid request, got %v", err)
 	}
 }
+
+func TestApplySellerListingPriceUsesSellerTotalPrice(t *testing.T) {
+	item := &ListingDTO{
+		Price: 238,
+		AssetSummary: map[string]any{
+			"price_breakdown": map[string]any{
+				"seller_total_price": 200,
+			},
+		},
+	}
+
+	applySellerListingPrice(item)
+
+	if item.Price != 200 {
+		t.Fatalf("expected seller price 200, got %.2f", item.Price)
+	}
+}
+
+func TestApplySellerListingPriceKeepsFallbackPrice(t *testing.T) {
+	item := &ListingDTO{
+		Price: 238,
+		AssetSummary: map[string]any{
+			"price_breakdown": map[string]any{
+				"seller_total_price": 0,
+			},
+		},
+	}
+
+	applySellerListingPrice(item)
+
+	if item.Price != 238 {
+		t.Fatalf("expected fallback price 238, got %.2f", item.Price)
+	}
+}