feat(distribution): 支持分销上传来源追踪、主站审核展示与收售结算模式自动判定

backend/internal/modules/listing/service_mutation.go

@@ -4,7 +4,7 @@ import (
 	"context"
 )
 
-func (s *Service) Create(ctx context.Context, ownerID uint64, req CreateRequest) (*ListingDTO, error) {
+func (s *Service) Create(ctx context.Context, ownerID uint64, req CreateRequest, siteCode ...string) (*ListingDTO, error) {
 	if s.repo == nil {
 		return nil, ErrDependencyUnavailable
 	}
@@ -29,7 +29,11 @@ func (s *Service) Create(ctx context.Context, ownerID uint64, req CreateRequest)
 	if err != nil {
 		return nil, err
 	}
-	return s.repo.Create(ctx, ownerID, req, reviewRequired, cooldown)
+	effectiveSiteCode := ""
+	if len(siteCode) > 0 {
+		effectiveSiteCode = siteCode[0]
+	}
+	return s.repo.Create(ctx, ownerID, req, reviewRequired, cooldown, effectiveSiteCode)
 }
 
 func (s *Service) Update(ctx context.Context, ownerID uint64, id uint64, req UpdateRequest) (*ListingDTO, error) {