feat: complete remaining Go backend modules

backend/internal/orchestration/artifacts.go

@@ -0,0 +1,46 @@
+package orchestration
+
+import (
+	"context"
+	"errors"
+
+	"git.nianxx.cn/wangxuming/NianAIGC/backend/internal/assets"
+	"git.nianxx.cn/wangxuming/NianAIGC/backend/internal/jobs"
+)
+
+type ScopedAssetDeleter interface {
+	Delete(context.Context, assets.Scope, string) (assets.Asset, error)
+}
+
+type AssetArtifacts struct{ assets ScopedAssetDeleter }
+
+func NewAssetArtifacts(service ScopedAssetDeleter) *AssetArtifacts {
+	return &AssetArtifacts{assets: service}
+}
+
+// DeleteOutputs is retry-safe: already absent objects are treated as deleted,
+// while persistence/storage failures stop job deletion.
+func (adapter *AssetArtifacts) DeleteOutputs(ctx context.Context, job jobs.Job) ([]string, error) {
+	if adapter == nil || adapter.assets == nil || job.OwnerID == "" {
+		return nil, errors.New("delete generation output assets")
+	}
+	seen := make(map[string]bool, len(job.OutputAssetIDs))
+	deleted := make([]string, 0, len(job.OutputAssetIDs))
+	for _, id := range job.OutputAssetIDs {
+		if id == "" || seen[id] {
+			continue
+		}
+		seen[id] = true
+		asset, err := adapter.assets.Delete(ctx, assets.PlatformScope(job.OwnerID), id)
+		if errors.Is(err, assets.ErrNotFound) {
+			continue
+		}
+		if err != nil {
+			return nil, errors.New("delete generation output assets")
+		}
+		deleted = append(deleted, asset.ID)
+	}
+	return deleted, nil
+}
+
+var _ jobs.ArtifactDeleter = (*AssetArtifacts)(nil)